Cyclograph rule 150 × 15 × 4 with pivot and brace holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/cyclograph-rule-150x15x4/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 150.0, width 15.0, height 4.0
- 150 × 15 × 4 straight rule with a Ø3 pivot hole at (5.77, 10) from its working corner and a Ø3 brace hole at (100, 7.5): two of them pinned at the apex and braced make a rigid 120° angle whose edges run on two pins.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
rule  150 × 15 × 4 mm
pivot hole  Ø3 at (5.77, 10)
brace hole  Ø3 at (100, 7.5)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 403: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_403.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/cyclograph-arc-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/cyclograph-rule-150x15x4/index.json
API: https://xemstudio.com/api/geometry?object=cyclograph-rule-150x15x4