Inshave

identity

• Primary term: inshave (also in-shave). No historical-dictionary attestation or etymology was retrieved; none is asserted (review fix 9).
• Documented names, by source (review fix 9):
  • Cooper's hollowing knife — Trowbridge Museum [I7].
  • Inshave Draw Knife, or Cooper's Scraper — Mississippi State catalogue title [I6].
  • Scorp — overlapping workshop vocabulary. Galbert subtitles a post "or the inshave or whatever you call it, I don't know" [I11]; Schwarz treats "The Scorp/Inshave" together [I-SCB]. Some users reserve "scorp" for tighter looped or single-handled forms; the exact referent must be resolved from the object, maker or source at hand.
  • Round shave, scorper, croom iron — retailer usage (Garrett Wade, Axminster) [I14][I31]; German Fasschaber — Axminster [I31]. Near-equivalents or trade names; not verified against a historical dictionary.
  • Compass drawknife — requires verification; not treated as a synonym.
  • Salaman, Mercer and Goodman were not retrieved; no boundary is legislated from them.
• Definition: a freehand shaving tool whose blade or cutting edge is curved to work concave wooden surfaces; often an open arc with two handles, pulled through the work.
• family / category: woodworking edge tools → concave shaving tools.

✦ how NOT to use it

not-for

• Prying, chopping, or any use outside a sound tool's design (review fix 5 reserves "not for" for these).

dangerous (injures the user) — review fix 3, the holding finding

Workholding does not by itself make a pull toward the body safe, and shaving horses vary: not every design tightens under every pulling direction.

• Inspect the blade, tangs, ferrules and handles. Do not use the tool if a handle is loose, the wood is cracked, the metal is bent or cracked, or the edge is damaged beyond controlled sharpening.
• Secure and support the work against the pulling load in a horse, vise, batten or cradle suited to the direction of load. Test it before bringing the edge to the wood.
• Plan the complete stroke and its runout. Arrange work and body so a slip, sudden release or completed pull ends in clear space — not the torso, thighs, hands, the clamp, or another person.
• Use both handles on a two-handled inshave. Start with a shallow engagement; increase the cut only after the tool's response is understood. Follow the grain and change direction when feedback shows splitting or lifting.
• Stop the tool before clearing chips, checking depth, measuring or moving the work. Never reach across or sweep a hand through the edge path.
• Keep others outside the stroke and chip path.
• Set down, transport and store with the edge protected — sheathed, racked, or facing away from traffic on a stable surface.
• Sharpening: immobilize the stone or the tool, use a method suited to the actual bevel face and curvature, keep fingers behind the edge, and follow the maker's model-specific method. Lie-Nielsen warns that drawknife sharpening is dangerous and recommends clamping the stone — analogous guidance, not inshave-specific [I25].
• PPE: eye protection is sensible where brittle material, grit, knots, chips or sharpening media can throw debris; it does not replace workholding and stroke geometry. Gloves are not prescribed generically: near a fine exposed edge they can reduce dexterity or snag.
• Catches: greater edge engagement on a curve can increase the severity of a catch; keep the first cuts shallow (review fix 11 replaces the "two-point lock" model).

damaging (ruins the tool or the work)

• Regrinding the bevel onto a different face (review fix 8). Documented tools exist with bevels on different faces — practitioners report outside-bevel contemporary scorps and an inside-bevel Barr [I12][I15][I16]. Preserve the maker's intended geometry unless a competent sharpener has a model-specific reason to change it. Reports about how bevel placement affects control are practitioner hypotheses, not a rule.
• Overshooting depth with a tight radius — "easy to overdo it" [I12][I28].
• Tear-out up the far wall where the grain reverses [I24].

beginner-trap

• Pulling straight along the grain into the hollow instead of across it on a skew [I10][I13].
• Choosing by name — "scorp," "inshave," "curved drawknife" name different objects; check curve, handles and bevel.

lineage-misuse

• Treating a curved-drawknife product as an inshave — Lie-Nielsen's is a different form [I25].
• Treating the functional comparison as ancestry — see above.

correct use

(Brief — the workbench holds deep operation.)

• Safety procedure first — see how NOT to use it → dangerous.
• Seat work: typically after the adze and before a travisher, scraper or abrasives; traverse across the grain with the cutter angled to the grain flow [I13]; pull on a skew rather than straight [I10]; keep wrists loose and respond to grain feedback, changing direction where the grain lifts or splits [I-ADB][I24].
• Work from both sides toward the low point; grain reverses up the far wall [I24].
• Coopering: the hollowing knife on the stave interior, the backing knife on the exterior [I7].

✦ matching (conditional — the reviewer's schema notes)

• Rapid freehand removal in a wooden hollow: an inshave or scorp whose curve and handle clearance suit the work.
• Chair-seat saddle: a flatter central curve may reduce follow-up work; a tight radius removes localized material more aggressively [I-SCB].
• Broad flat or convex surface (review fix 5): its curve is optimized for concave work; on broad flat or convex stock it has limited contact, and a straight drawknife or spokeshave is normally easier to register. A tendency, not a prohibition.
• Lighter, sole-guided refining in a hollow: a travisher or curved-bottom shave [I20][I26].
• One-handed access: a scorp-labelled loop or single-handle form may fit; confirm the actual object, not the name.
• Coopering: the rounded hollowing knife for stave interiors, the backing knife for exteriors [I7].
• Finish (review fix 5): in contemporary chairmaking the inshave is usually a rapid shaping tool, followed by a travisher, scraper or abrasives when a smoother saddle is wanted; a skilled user with a sharp edge can leave a serviceable surface, and some work keeps a tooled surface on purpose.
• Access: an exposed-edge tool pulled toward the user; learn with instruction and the procedure below.

anatomy (by model — review fixes 7, 11)

Record per model: working radius and blade curvature; open two-handled vs. tighter looped or single-handled form; handle angle and clearance above the work; intended hollow depth and width; maker-prescribed bevel face and sharpening geometry.

• Blade: curved out of the cutting plane to follow a hollow. Hirsch inshave (Highland): 5 mm blade, 25° bevel; Sharky (forgedsteeltools): 52100 steel, 59–62 HRC, sizes by arc width [I27]. These describe those products only; no class-wide hardness or geometry range is given.
• Radius — a selection variable. A tight curve removes localized material quickly and can overshoot; a flatter central curve can fit a shallow saddle and reduce follow-up work [I12][I-SCB][I10]. Radius depends on the contact zone and technique; there is no hard matching rule.
• Tangs and handles: two tangs to two handles on the common form; handle angle sets clearance and pull angle, and bowl models sweep the handles back [I10][I18][I20].
• No sole, mouth or depth stop: depth is controlled by presentation.
• Related, not the same form — Lie-Nielsen "Curved Drawknife" [I25]: a drawknife with a slight forward/downward curve after an antique Witherby, not a pronounced out-of-plane inshave arc. Its dimensions and bevel instructions describe that product; its sharpening warning is used below only as analogous drawknife guidance.

trades

• Windsor and Welsh stick chairmaking — roughing seat hollows [I13][I19][I20][I21].
• Green-wood bowl, trough and treen carving [I18].
• Coopering — stave interiors, now largely historical [I6][I7].

history (bounded)

• Theophilus (review fix 1). In a text generally dated to the early twelfth century (De Diversis Artibus, Book I, ch. 17, Hawthorne and Smith translation), Theophilus describes a two-handled tool translated as curved and sharp on the inside, drawn with both hands to smooth glued wooden panels, doors and shields [I1]. It is evidence for an early curved two-handled shaving or planing tool. Identifying it specifically as a modern inshave requires further terminological and iconographic support; it is not presented as the earliest description of any tool, and it does not resolve the Drawknife entry's history.
• Medieval archaeology (review fix 2). Secondary literature reports curved and straight drawn tools in medieval archaeological contexts, including Mästermyr, Novgorod and York [I2]. The item-level identifications and dates require direct verification. York Archaeological Trust confirms Carole A. Morris, Craft, Industry and Everyday Life: Wood and Woodworking in Anglo-Scandinavian and Medieval York (2000, The Archaeology of York 17/13), with the 16–22 Coppergate material primarily c.850 to the late eleventh century [I4]; the landing page does not itself support the reported tool dimensions or a narrower date. No chronology between curved and straight forms is claimed.
• Coopering (strongest history). Trowbridge Museum object TRWBM:1980.16, a cooper's hollowing knife used by Les Perret at Usher's Brewery, 1918–69, paired on the label with the flat backing knife for the stave exterior [I7]. (The museum blog's claims about Egyptian "barrels" and 4,600 years of unchanged technique are unsourced and not inherited.) Mississippi State's "Inshave Draw Knife, or Cooper's Scraper," with stated use on stave interiors [I6]. A c.1900 catalogue section "Cooper's Spoke Shaves, Inshaves and Froes" is reported by Toolemera [I30].
• Patents (review fix 6). No patent titled "inshave" or "scorp" was found in the reviewed DATAMP drawknife category (42 patents, 1857–1921). Two related records: Peter & Paul Keltsch, US 547,924 (1895), "Instrument for Planing or Scraping Out Round Objects," and Alexander C. Thomas, US 1,051,526 (1913), "Curved Draw Knife"; DATAMP notes both as not known to have been produced [I8]. No inference is drawn about novelty or naming.

✦ human side

• Coopers — the hollowing-knife and backing-knife pair; Les Perret, Usher's Brewery, 1918–69 [I7].
• Chairmakers:
  • Christopher Schwarz — has saddled seats for nearly 20 years with one Barr scorp; the tight 2¼″ Barr "can hollow out a seat with incredible speed… it's easy to overdo it," while a flatter Avery inshave "cuts down on the time I spend with the travisher considerably" [I12][I-SCB]. Sequence: scorp → travisher → card scraper → sandpaper → scraper [I13].
  • Peter Galbert — uses scorp and inshave interchangeably; pulls on a skew; a tight-radius tool suits bowls, a Windsor saddle a flatter curve [I10][I11].
  • Curtis Buchanan — "a curved adze, an inshave, and a travisher" for the seat [I19].
  • Elia Bizzarri — inshave/scorp roughs, the travisher is "an intermediate tool… between initial shaping with an inshave and fine-tuning the surface with a card scraper"; Ray Iles handles may need bending up to clear a seat [I20].
  • John Brown and Christopher Williams — Welsh stick chairs; after the scorp, a No. 53 spokeshave "as a surrogate travisher" [I21][I-GW]. Williams's Good Work also shows the inshave is optional in some workflows [I-GW].
• Bowl carvers — David Fisher's inshave is about 4½″ across with handles that sweep back to clear a deep bowl [I18].

✦ proof of existence

• Trowbridge Museum TRWBM:1980.16, cooper's hollowing knife, Les Perret, 1918–69 (HIGH) [I7].
• Mississippi State University, "Inshave Draw Knife, or Cooper's Scraper," Cobb-Priester tool collection (HIGH) [I6].
• Current makers and chairmaking literature (Schwarz, Williams, Galbert, Bizzarri, Barr, Hirsch, Sharky) [I-SCB][I-GW][I10][I20][I27].
• Patent records: Keltsch US 547,924 (1895); Thomas US 1,051,526 (1913) [I8].
• Held as open research, not proof: Theophilus's curved tool [I1]; reported Mästermyr, Novgorod and York examples [I2][I4].

references

Forum, retailer and blog sources carry attributed workshop experience only; none carries dating, etymology, universal anatomy, safety sufficiency or descent.

• [I1] Theophilus, De Diversis Artibus, Book I ch. 17, trans. Hawthorne & Smith (1963; Dover repr.), https://archive.org/details/ondiversartstrea00theo — early textual description; page to be cited from the edition.
• [I2] Marijn (St. Thomas Guild), "The medieval toolchest: drawknife" (2012), https://thomasguild.blogspot.com/2012/05/medieval-toolchest-drawknife.html — secondary; leads only.
• [I4] York Archaeological Trust, Carole A. Morris, Craft, Industry and Everyday Life: Wood and Woodworking in Anglo-Scandinavian and Medieval York (2000), https://www.collections.yorkarchaeologicaltrust.co.uk/s/collections/item/74502 — monograph record; page and catalogue number still needed.
• [I6] Mississippi State University Libraries, "Inshave Draw Knife, or Cooper's Scraper," https://scholarsjunction.msstate.edu/msugm-cobb-priestertoolcoll/54/ (HIGH).
• [I7] Trowbridge Museum, "Closer Look – Coopers hollowing knife," https://trowbridgemuseum.co.uk/closer-look-coopers-hollowing-knife/ (HIGH for the object).
• [I8] DATAMP, draw-knife patent class (1857–1921) — Keltsch US 547,924; Thomas US 1,051,526.
• [I-SCB] Christopher Schwarz, The Stick Chair Book, revised (2023), "The Scorp/Inshave," https://blog.lostartpress.com/wp-content/uploads/2023/07/The-Stick-Chair-Book-REVISED-Consumer-July-2023.pdf (reviewer-named).
• [I-GW] Christopher Williams, Good Work excerpt, https://blog.lostartpress.com/wp-content/uploads/2020/02/good_work_excerpt.pdf (reviewer-named).
• [I-ADB] Christopher Schwarz, The Anarchist's Design Book, expanded (2024), "Scorping," https://blog.lostartpress.com/wp-content/uploads/2024/02/ADB_expanded_2024.pdf — workholding, across-grain seat work, loose wrists, grain feedback (reviewer-named).
• [I10] Peter Galbert, "Inshaves," Chair Notes (2007), http://chairnotes.blogspot.com/2007/05/inshaves.html.
• [I11] Peter Galbert, "Tackling the Scorp" (2024), https://petergalbert.substack.com/p/tackling-the-scorp.
• [I12] Christopher Schwarz, "Inshave from Blacksmith Lucian Avery," Lost Art Press blog (2021).
• [I13] Christopher Schwarz, "Saddling a Seat," https://blog.lostartpress.com/2017/01/29/saddling-a-seat/.
• [I14] Garrett Wade, "Traditional Woodworker's Inshave," https://garrettwade.com/products/traditional-woodworkers-inshave — retailer usage.
• [I15] "Inshave Sharpening," Sawmill Creek (2008), https://sawmillcreek.org/threads/inshave-sharpening.83650/ — forum, attributed practice.
• [I16] "A Question About Scorps," Sawmill Creek (2020), https://sawmillcreek.org/threads/a-question-about-scorps.280162/ — forum, attributed practice.
• [I18] David Fisher, "Inshave," Carving Explorations (2021), https://davidffisher.com/2021/01/20/inshave/.
• [I19] Curtis Buchanan, comb-back Windsor video series (Ep. 15, 17), https://www.youtube.com/watch?v=x8nJcB2oav4; Garden & Gun, "Tennessee's Chairmaster."
• [I20] Elia Bizzarri, "Chairmaking Tool List" and "Using a Travisher," handtoolwoodworking.com.
• [I21] Lost Art Press blog, "John Brown's Tool Kit" (2020).
• [I24] "Drawknives, Scorps, Jiggers and Inshaves," Wood Carving Online, https://woodcarvingonline.com/drawknives-scorps-jiggers-and-inshaves/.
• [I25] Lie-Nielsen Toolworks, "Curved Drawknife," https://www.lie-nielsen.com/products/1-draw-c-drawknives — related drawknife, not an inshave; sharpening warning (reviewer-named, narrowed).
• [I26] James Mursell, "Evolution of the Travisher," https://travisher.com/evolution-of-the-travisher/ — maker.
• [I27] Highland Woodworking (Hirsch inshave), https://www.highlandwoodworking.com/products/hirsch-inshave; Sharky Forged Steel Tools, https://forgedsteeltools.com/products/hand-forged-inshave-half-rounded-drawknife-13-cm-5-1-inches — product specs only.
• [I28] "Choosing a New or Used Chairmaker's Scorp or Inshave," chairmaking.org (2024).
• [I30] Gary Roberts, "An Etymology of Woodworking Draw Knives," Toolemera Press (2024).
• [I31] Axminster Tools, Kirschen inshave, https://www.axminstertools.com/kirschen-inshave-106188 — retailer usage.
• Removed from load-bearing use: [I3] Mästermyr catalogue and [I5] Novgorod publication (not retrieved), [I9] (generic survey), [I17] (naming forum), [I22] (Wikipedia), [I23], [I29] RockaWave, [I32]–[I34] (Salaman, Mercer, Goodman — not retrieved), [REED] (internal, not a source).

a modern functional comparison (review fix 4 — not a genealogy)

One useful way to compare these tools is by blade curvature and whether a sole limits engagement: a Drawknife and an inshave are freehand shaves; a Spokeshave and a Travisher add registering bodies. In chairmaking, an inshave commonly removes waste before a travisher refines the hollow [I13][I20]. This is a functional map, not proven descent: the travisher is a related sole-guided concave shave, not established as the inshave's descendant, and a travisher can also remove substantial material [I26].

open research questions

• Theophilus: the Latin term and form, and any specialist identification.
• Mästermyr, Novgorod and York: item numbers, plates, dimensions, dating basis.
• Salaman, Mercer, Goodman entries for inshave and scorp.
• The travisher's earliest dated appearance.

The reviewer's corrections (11)

• BLOCKER — 1. Recast the Theophilus identification and remove the unsupported “earliest” superlative — Exact claim: “The earliest datable written description of any two-handled drawn tool in the Western record describes a curved one — an inshave,” and “The curved member owns the family's earliest words.”
• BLOCKER — 2. Do not claim coeval archaeological forms from unverified secondary identifications — Exact claim: “The evidence shows the two as coeval,” with curved and straight forms “appearing together in the earliest physical record (Mästermyr ~1000 AD)” and inshaves present in eleventh-century Novgorod.
• BLOCKER — 3. Add a complete, geometry-aware safety procedure — Exact claim: “Pull it toward you… the body to the side of the stroke,” and “the shaving horse… [is] the reason the bare blade pulled toward the torso is, in practice, a controlled stroke.”
• SHOULD-FIX — 4. Present the 2×2 as a comparison, not exact descent — Exact claim: “The inshave is to the travisher exactly what the drawknife is to the spokeshave,” and the travisher is “the descendant” produced by adding a sole, repeating a “risk → certainty” arc.
• SHOULD-FIX — 5. Remove absolute prohibitions that contradict documented practice — Exact claim: “Not a finishing tool. It roughs; it cannot leave a final surface,” “Not for flat or convex surfaces,” and “an inshave tears trying to take a flat or convex surface.”
• SHOULD-FIX — 6. Delete the patent-absence inference — Exact claim: “Zero of DATAMP's 42 drawknife patents are titled inshave/scorp — the curved bare blade has no patentable novel mechanism,” followed by “What little got patented around this tool avoided its own names.”
• SHOULD-FIX — 7. Separate inshaves from merely curved drawknives in the anatomy evidence — Exact claim: The Lie-Nielsen “Curved Drawknife” is used to support inshave blade dimensions, hollow-ground back, natural skew, handle adjustment, and safety.
• SHOULD-FIX — 8. Reframe bevel orientation as model- and technique-specific — Exact claim: “Reasoned chairmaker consensus is bevel-OUTSIDE,” while the Barr/Dunbar scorp is said to be the “single most trade-defining tool” that contradicts the principle.
• SHOULD-FIX — 9. Tighten nomenclature and etymology — Exact claim: “Inshave” is defined as “in-” plus “shave” because “the cut runs into a concavity,” while scorp is “strictly” a single-handled more-closed-loop form and the inshave is called a dozen other names.
• SHOULD-FIX — 10. Remove orchestration residue and recalibrate confidence — Exact claim: The provenance records “the model orchestrated; 3 parallel research passes,” lists prior model judgments, and rates the entry “medium-high,” including its lineage and proof block.
• MINOR — 11. Remove unsupported mechanical and cross-trade universals — Exact claim: The curve “can catch at TWO points at once,” two handles inherently provide more control, the radius “must” match or be tighter than the hollow, and “there is no metal/stone equivalent.”