# Grasshopper Gauge

Hewn Tool Library · https://hewn.build/tools/grasshopper-gauge

Reviewed: An independent reviewer read this entry and found corrections. None of them is a way for a person to get hurt, so it is published now. The corrections are listed at the end and are not yet applied to the text: read it with them in hand.

Cite as: "Grasshopper Gauge." Hewn Tool Library, hewn.build/tools/grasshopper-gauge. Reviewed 2026-09-04.

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## identity

**Name**: Grasshopper Gauge
**Regional / alternate names**: Raised-Beam Gauge (descriptive, not independently attested as a period name); "Coachmaker's Wheelwright's Marking Gauge" (a dealer/collector compound name found this run [GG3]); the raised-beam modification is also attested applied to a *mortise*-gauge body under the same "grasshopper" name, not only a marking-gauge body (see Variations).
**Family / category**: Layout and marking tools → Edge-referenced scribing gauges → [[Marking Gauge]] family, raised-beam branch — a structural variant (beam height) rather than a new marking mechanism, distinct from the mechanism-variant branches already in this corpus ([[Wheel Marking Gauge]], [[Wari-Kebiki (Splitting Gauge)]], [[Combination Gauge]]).
**One line**: A marking gauge (or, in at least one attested case, a mortise gauge) with its beam raised well above the fence plane, so the pin can reach down and scribe a line on stock that has an obstruction — a rebate, a curve, a projecting member — sitting between the fence's registration face and where the line actually needs to go.

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## ✦ how NOT to use it

### Not-for: jobs the grasshopper gauge should never do
- **Ordinary flat-stock marking with no obstruction present.** Reasoned, not directly sourced: there is no documented reason to choose a raised, less direct beam path over a standard low-beam gauge for a job the standard gauge already handles cleanly.

### Dangerous: misuse that injures the user
- **Not found despite direct, repeated searching.** No source — forum, blog, dealer listing, museum record — located this run describes any injury account for this tool. Stated plainly as an honest gap, consistent with this corpus's own findings for several sibling gauge-family entries ([[Butt Gauge]], [[Panel Gauge]], [[Wari-Kebiki (Splitting Gauge)]], [[Combination Gauge]]).

### Damaging: misuse that ruins the tool or the work
- **Not found specific to this tool.** A research pass surfaced generic marking-gauge beam-wobble discussion (a Fine Woodworking forum thread, a Scribe-Mate product blog) describing standard-gauge stability problems, but nothing in either source is about the raised-beam form specifically — this entry does not present that generic material as grasshopper-specific, per the research pass's own explicit caution.
- **A reasoned, unsourced mechanical inference, stated at that weight and no higher**: a beam raised above the fence's registration plane sits on a longer, less directly supported path from the fence to the pin than a standard low beam. By ordinary lever mechanics, the same amount of side-pressure or fence slop would be expected to produce more deflection at the pin on a raised-beam gauge than on a standard one — but no source read this run confirms this happens in practice, or names it as a real, observed failure of this specific tool.

### Beginner-trap: mistakes that look fine until they aren't
- **Assuming it handles exactly like a standard gauge.** Reasoned, not sourced: a maker used to a standard low-beam gauge's feel and leverage might not anticipate that a raised beam changes hand position and, per the reasoned mechanical point above, possibly changes how much fence pressure is needed to hold the line true. No documented account of this actually tripping someone up was found.

### Lineage-misuse: treating it like its ancestor or cousin
- **Treating it as a general-purpose replacement for a standard marking gauge.** It is the same family with one dimension changed for one specific reason; nothing found this run suggests it performs as well as, or better than, a standard gauge on ordinary work — its complete absence from commercial catalogs across seven decades [GG5] is the strongest evidence against using it as an everyday tool.
- **A name collision worth naming, checked and ruled out as an actual documented confusion.** "Grasshopper" is also the name of an unrelated 18th-century steam-engine beam configuration (the "grasshopper beam engine," per a period-engineering source [GG7, search-snippet only]) — a completely different trade and mechanism, no connection found beyond the shared word. No source documents anyone actually confusing the two.
- **A second name-collision risk, checked and ruled out as a different tool entirely.** A "spider gauge" is a real but unrelated tool — used to measure saw-tooth set on hand saws, not a marking/scribing gauge at all [GG8, search-snippet only]. Worth naming precisely because both names evoke a many-legged/reaching shape for a tool that projects outward from a body, which makes them easy to conflate by association even though the tools themselves share nothing.

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## correct use

**What it's genuinely good at**: reaching a marking pin past a physical obstruction that a standard low-beam gauge's beam would collide with before the pin ever touched the stock — the raised beam clears the obstruction; the fence still registers off the same reference edge a standard gauge would use.

**How to use it well (short version)**: register the fence against the same reference edge/face a standard gauge would use; the raised beam simply gives the tool room to pass over whatever's in the way (a rebate lip, a curved member, a projecting housing) on its way to the marking point. the workbench holds the deep operation; no source located this run describes technique beyond this structural principle.

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## ✦ matching

**does**: scribes a single reference line (or, in the mortise-gauge variant, a mortise pin-pair layout) across stock where a physical obstruction sits between the fence's registration point and the mark — the tool's whole reason for existing is reach, not a different marking mechanism.

**suits**: coachbuilding and wheelwrighting curved-panel and rebate work, per the tool's one directly-cited trade attribution [MG34]; possibly stair/handrail joinery and timber-framing, per two lower-confidence secondary leads (Salaman via Wikidata [GG2]; the mortise-gauge/timberframe listing title [GG4]) — stated as a plausible scope expansion, not a confirmed one.

**kit-fit**: PAIRS WITH a standard [[Marking Gauge]] or mortise gauge, used for the great majority of ordinary flat-stock layout — the grasshopper form is reached for only when the standard tool physically cannot clear an obstruction. Does **NOT** substitute for a standard gauge generally; nothing found this run suggests it's a general-purpose upgrade, and its complete absence from seven decades of a major coachbuilding-tool catalog [GG5] supports that it solves one narrow problem and nothing else.

**not-for (project-keyed)**: ordinary flat-stock marking with no obstruction in the way — reasoned, not sourced: a raised beam is, by ordinary construction logic, a less direct, less rigid path from fence to pin than a standard low beam, so there is no reason to reach for it when the standard tool already reaches the line cleanly.

**access**: genuinely unknown. No beginner account, no build-difficulty report, no skill-level guidance was found anywhere. Because every source located frames this as a shop-made tool rather than a purchased one, the real access question for a modern maker is likely "can I build one" rather than "can I use one" — a reasoned point, not a sourced one.

**revival**: worth surfacing to a maker specifically when a project involves marking a line past a real obstruction a standard gauge can't clear — a curved or rebated member, a housed step, a handrail return — which is exactly the narrow, real-world trigger this tool's entire sourced history points at, rather than a general "try an old tool" prompt.

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## anatomy

**Limited to what the tool's own name and one-line description state; no measured drawing or close construction detail was found.** The beam sits raised above the fence's registration plane — how far, by what means it's joined to the fence (a riser block, an angled shoulder, a longer stock cast or carved to lift the beam), and how the pin is carried back down to stock height, was not described by any source located this run. The single physical example on record (the Arnold Zlotoff/eHive piece) gives only overall dimensions (6¾" × 4" [GG1, unverified snippet]) with no anatomical breakdown. This is a genuine open gap in the entry — Forge would need a period photograph or a hands-on physical example to build an accurate labeled diagram, not this run's sourcing alone.

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## variations

| Variant | What differs | What it's for |
|---|---|---|
| **Grasshopper marking gauge** (single pin) | Beam raised above the fence plane; otherwise a standard marking-gauge mechanism | Scribing a single reference line over an obstruction, curve, or uneven surface — carriage-building [MG34]; possibly handrail/stair-joinery, per an unverified secondary citation of Salaman [GG2] |
| **Grasshopper mortise gauge** (pin pair) | Same raised-beam treatment applied to a twin-pin mortise-gauge body | Attested only by a single dealer-listing title, "Antique Carpenter's Mortise Gauge Grasshopper Timberframe" [GG4] — timber-framing context, not independently corroborated |

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## trades

- **Carriage / coach building** — the one directly-sourced trade attribution: "the grasshopper form for scribing over irregular surfaces" [MG34].
- **Wheelwrighting** — named in the compound dealer term "Coachmaker's Wheelwright's Marking Gauge Grasshopper" [GG3], consistent with this corpus's existing note that wheelwrights and carriage makers shared much of the same tool culture.
- **Stair joinery / handrail work** and **timber framing** — two lower-confidence, unconfirmed leads (Salaman via Wikidata's "handrails" phrasing [GG2]; a mortise-gauge/timberframe listing title [GG4]) suggesting the raised-beam idea traveled beyond carriage work into other obstruction-heavy joinery trades — named honestly as unconfirmed, not folded into the sourced trade list above.

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## lineage

**Ancestors**
- **The plain [[Marking Gauge]], directly.** [[Marking Gauge]]'s own existing entry already carries this tool as a named variant of itself, not as a separate invention: "carriage makers used the raised-beam 'grasshopper' form to scribe over obstructions" [MG34, cited here as GG1]. Nothing found this run suggests the grasshopper form is anything other than a standard low-beam marking gauge with the beam raised — the marking mechanism (pin, fence, thumbscrew) is unchanged; only the beam's height and, implicitly, its reach past an obstruction changes.

**Descendants** — none found. No source located this run describes a further evolution of the raised-beam idea into a distinct later tool.

**Contemporaries**
- **The standard-height mortise gauge**, applied to the same raised-beam idea. An eBay listing title read this run — "Antique Carpenter's Mortise Gauge Grasshopper Timberframe," 13½" arms, no maker's mark, missing wedge [GG4, title/search-snippet only, direct fetch blocked] — names a *mortise*-gauge body carrying the "grasshopper" raised-beam treatment, used in timber-framing rather than carriage work. This is a genuine, if thinly sourced, structural point: the raised-beam modification is not confined to the plain-pin marking gauge, it appears to have been applied wherever a gauge's normal low beam ran into an obstruction, regardless of which pin arrangement sat on the far end. Held at low confidence — a single listing title, not independently corroborated.
- **[[Butt Gauge]]**, the door-hinge specialist branch of the same parent family — a different kind of specialization (a fixed, purpose-built preset rather than a raised beam) solving a different problem (repeatable hinge-mortise layout) within the same broad [[Marking Gauge]] family.

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## history

**No dateable origin point was found.** Every account of this tool traces back, directly or indirectly, to the same handful of sources, and none states when or by whom the raised-beam idea was first built. This is an honest gap, not an unexamined one — a research pass searched period trade literature, patent databases, and collector-society material directly and came back empty (see Proof of Existence).

**The single dated object behind this tool's entire documentary trail carries a real ambiguity, worth stating plainly.** eHive's catalog record for the Arnold Zlotoff Tool Museum's example is titled *"'Grasshopper' Marking Gauge; 1886"* [GG1] — but the page itself could not be directly read this run (JavaScript-rendered; two independent fetch attempts, one by a research research passes and one by the orchestrating run, both returned empty). Every fact about this object — the "1886" figure, the 6¾" × 4" dimensions, the wood-body/metal-pin construction — comes from a search-engine snippet of the page, not a direct read. Whether "1886" is a manufacture date, a date range for the museum's broader collection, or an accession number was not confirmed by any source read this run. This corpus does not treat "1886" as a settled manufacture date; it is carried here as an unverified figure from an uncrackable source, flagged for a future run with real browser access.

**A real, meaningful negative: the raised-beam form never appears in a major coachbuilding-trade toolmaker's catalog.** William Marples & Sons — one of the two major English toolmakers documented elsewhere in this corpus as explicitly serving the coachbuilding and wheelwrighting trades — published catalogs across at least six eras (1888, 1897, 1909, 1928, 1938, 1959) that included side axes, cramps, draw-bore pins, T-plane irons, trimmers' hammers, spider mortice bevels, coach shaves, and (by 1928) an 18" panel gauge — but no "grasshopper" or raised-beam gauge appears in any catalog year located and checked [GG5, directly fetched]. This is consistent with, and independently supports, the framing already in [[Marking Gauge]]'s own entry: "now shop-made only" [MG34]. A tool this narrowly purpose-built, never catalogued commercially across seven decades by a toolmaker who otherwise served this exact trade, reads as a bespoke or blacksmith-made shop tool rather than a manufactured product line — a real inference, not a sourced statement, but a well-supported one.

**A second negative, from the trade's own literature.** *A Practical Treatise on Coach-Building* (1881), the standard period English coachbuilding trade manual, was fetched and full-text searched in its entirety (over 116,000 characters) for "gauge," "guage," and "gage" in every spelling, and for "grasshopper" directly [GG6, directly fetched and searched]. Zero matches for any of them. The manual describes the trade's divisions in detail — body maker, wheelwright, smith, trimmer, painter — but is silent on marking/layout tools of any kind, not only this one. This should be read as a limit of the source (it doesn't cover hand-tool layout technique at all), not as evidence the grasshopper gauge didn't exist in the coachbuilding trade.

**R. A. Salaman's own dictionary appears to be the one real documentary anchor for this tool, but was not independently verified this run.** A Wikidata entry (Q105428928) attributes its definition of the "grasshopper gauge" — "a type of tall woodworking marking gauge used for working around obstructions such as handrails" — to Salaman's *Dictionary of Tools Used in the Woodworking and Allied Trades, c. 1700–1970*, page 201 [GG2]. This is genuinely useful: Salaman is this corpus's own bedrock reference for cataloging tool variations precisely, and "handrails" broadens the trade attribution beyond carriage-building specifically into stair/joinery obstruction work generally — a real, if unconfirmed, expansion of scope. But the Wikidata page itself could not be directly read this run (JS-rendered, empty on fetch), and no source located actually quotes Salaman's page-201 text directly. This is carried as a lead for a future run with access to the physical or scanned dictionary, not as a verified citation.

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## ✦ human side

**Genuinely, unusually thin — stated plainly rather than filled with generic material.** A dedicated research pass searched LumberJocks, Sawmill Creek, Woodnet, Reddit (r/woodworking, r/handtools), Popular Woodworking, Fine Woodworking, and Lost Art Press / Christopher Schwarz's own writing (a named source this corpus has used elsewhere for exactly this kind of historical-gauge-form material) specifically for build logs, named makers, or discussion threads about this tool. **None were found.** No named maker, no first-person build account, no forum thread discussing the tool by name turned up anywhere in the accessible web. This is a real finding about the tool's presence in the living record, not a failed search — the query variants were thorough and the negative was consistent across every target checked.

**The one dealer-side data point with any human texture at all.** A Worthpoint listing for a "Coachmaker's Wheelwright's Marking Gauge Grasshopper" [GG3, directly fetched and read in full] describes the piece as "one of seven different unusual marking gauges" being sold together — implying a collector or estate lot recognized this as a distinct, nameable trade tool worth grouping with its cousins, though the listing gives no maker, no named owner, and no use-case story.

**No named coachbuilder, wheelwright, or joiner's own account of using one on a real job was found.** The trade texture this corpus usually carries — a specific rebate, a specific curved panel, a specific spoke or fender — is absent here. The entry states that gap directly rather than inventing a plausible-sounding scenario.

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## ✦ proof of existence

**The one physical example on record could not be directly verified this run.** eHive's catalog page for the Arnold Zlotoff Tool Museum's "'Grasshopper' Marking Gauge; 1886" [GG1] — wood body, metal pin, 6¾" × 4" — is JavaScript-rendered and returned empty on two independent direct-fetch attempts (one by a research research passes, one by the orchestrating run). Every fact about this object is search-snippet reconstruction, not a direct read. This is the corpus's existing [MG34] citation, carried forward at the same confidence, not upgraded.

**A second marketplace record, directly read in full.** Worthpoint listing #30254064, "Coachmaker's Wheelwright's Marking Gauge Grasshopper" [GG3] — a dealer/collector listing (sourced from an online marketplace, not a museum), independently confirming the tool circulates in the antique-tool trade under this compound name. This is genuinely new evidence beyond [MG34] — a second, independent source using the same term for what appears to be the same tool type.

**Two further marketplace title-only leads, unverified.** An eBay listing, "Antique Carpenter's Mortise Gauge Grasshopper Timberframe" [GG4], and a Picclick listing, "Vintage Carpenter's Grasshopper Handrail Marking Gauge" [GG9] — both direct-fetch blocked (JS-gated), carried at title/search-snippet confidence only.

**Real, directly-verified negatives — checked and ruled out, not simply unexplored.**
- Not present in the Science Museum Group's own wheelwright tool collection donated by R. A. Salaman himself (object co45503) — directly fetched; the collection lists gouges, axes, calipers, chisels, and a coachbuilder's side axe, but no gauge of any kind [GG10].
- Not present in the Scottish STICK Master Catalogue of Woodworking Tools, a directly-fetched, full-text-searched 1,232-line PDF covering "cutting, marking, mortice, panel, rim, spoke" gauge types across multiple real Scottish museum collections (Falkirk, Glasgow, Elgin) — zero occurrences of "grasshopper" [GG11].
- No patent exists under this name: DATAMP's full "curve marking gauges" category (19 American patents, 1855–1922) was directly read and contains no grasshopper/raised-beam design [GG12]; Google Patents searches for "grasshopper gauge," "raised beam gauge," and "carriage maker's gauge" returned nothing on-topic.
- Not present in any William Marples & Sons catalog year checked (1888–1959), a toolmaker who explicitly served the coachbuilding trade [GG5].

**Honest gaps, stated plainly.** No Mercer Museum, Winterthur, Museum of English Rural Life, or Amgueddfa Cymru record was located — not checked directly this run, flagged as unexplored rather than a confirmed absence. Salaman's own dictionary text (page 201, per the Wikidata attribution [GG2]) was not independently read. EAIA's *The Chronicle* and MWTCA's *The Gristmill* — the tool-collector-society journals this corpus has used successfully for other gauge-family entries — were not searched directly (their archives aren't reachable via general web search); a future run with direct archive access should try there first.

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## references

- [GG1] eHive, "'Grasshopper' Marking Gauge; 1886," Arnold Zlotoff Tool Museum — ehive.com/collections/4388/objects/209321/grasshopper-marking-gauge. This corpus's existing [MG34]. kind: museum (search-snippet only — direct fetch failed twice this run, JS-rendered page)
- [GG2] Wikidata, "grasshopper gauge" (Q105428928), attributing its definition to R. A. Salaman, *Dictionary of Tools Used in the Woodworking and Allied Trades, c. 1700–1970*, p. 201. kind: encyclopedia/bibliographic lead (search-snippet only — direct fetch of the Wikidata page failed, and Salaman's own text was not independently located)
- [GG3] Worthpoint, "Coachmaker's Wheelwright's Marking Gauge Grasshopper," item #30254064 — worthpoint.com/worthopedia/coachmakers-wheelwrights-marking-gauge-grasshopper. kind: dealer/auction listing (directly read in full)
- [GG4] eBay listing, "Antique Carpenter's Mortise Gauge Grasshopper Timberframe." kind: dealer listing (title/search-snippet only — direct fetch JS-blocked)
- [GG5] William Marples & Sons, catalogue history (1888, 1897, 1909, 1928, 1938, 1959 editions referenced) — williammarplesandsons.com. kind: manufacturer history (directly fetched)
- [GG6] *A Practical Treatise on Coach-Building* (1881), Project Gutenberg #72016. kind: period trade manual (directly fetched and full-text searched — negative result: no mention of gauges or "grasshopper")
- [GG7] General source on the "grasshopper beam engine" (18th/19th-century steam-engine beam configuration). kind: encyclopedia (search-snippet only — used only to rule out a name collision, not as tool history)
- [GG8] General source on the "spider gauge" (saw-tooth-set measuring tool, unrelated to marking gauges). kind: reference (search-snippet only — used only to rule out a name collision)
- [GG9] Picclick listing, "Vintage Carpenter's Grasshopper Handrail Marking Gauge." kind: dealer listing (title/search-snippet only — direct fetch JS-blocked)
- [GG10] Science Museum Group, wheelwright tool collection (R. A. Salaman donor credit), object co45503. kind: museum (directly fetched — negative result: no gauge in the collection)
- [GG11] STICK (Scottish Traditional Industries Collective/Catalogue), Master Catalogue of Woodworking Tools PDF. kind: museum-consortium catalogue (directly fetched and full-text searched — negative result)
- [GG12] DATAMP (Directory of American Tool and Machinery Patents), "curve marking gauges" category, 19 patents 1855–1922. kind: patent directory (directly read — negative result, no grasshopper-named patent)
- [GG13] Fine Woodworking forum thread on marking-gauge beam wobble; Scribe-Mate product blog. kind: forum/blog (search-snippet only — generic marking-gauge material, explicitly NOT presented as grasshopper-specific in this entry)
- [GG14] woodandshop.com, "Woodworking Gauges Tool Buyer's Guide Part 1." kind: blog (directly fetched — contains no mention of the grasshopper gauge; used here only as a caution that a WebSearch AI-summary claimed content this page does not actually contain)

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## forge images needed

- A side-by-side comparison: a standard low-beam marking gauge next to a grasshopper (raised-beam) form, showing the beam-height difference and how the raised beam clears an obstruction a standard beam would hit.
- A worked example: stock with a rebate or curved member in the way, showing how the raised beam reaches the pin past the obstruction to the marking line — since no source gave a precise anatomical description this run, this image would need to be built from the tool's stated principle rather than a measured original, and should be flagged to Jonathan as speculative/schematic rather than historically exact until a real physical example or photograph is found.

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## The reviewer's corrections (10)

- `BLOCKER` — 1. Replace the raised-beam identity with the documented long-fence, adjustable-stem form
- `BLOCKER` — 2. Correct the primary use and trade matching
- `SHOULD-FIX` — 3. Remove the unverified mortise-gauge branch
- `SHOULD-FIX` — 4. Replace the “no period source” and “single dated object” narrative
- `SHOULD-FIX` — 5. Add the attested alternate names without forcing them into one universal form
- `SHOULD-FIX` — 6. Withdraw mechanical deductions built on the wrong geometry
- `SHOULD-FIX` — 7. Narrow the catalogue-absence inference
- `SHOULD-FIX` — 8. Replace “no injury account” with actual handling controls
- `MINOR` — 9. Remove process residue and failed-search theatre
- `MINOR` — 10. Re-grade confidence by claim family