Single Spanish burton (3 : 1) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/spanish-burton-single-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 16 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- Rope 1 runs from the load over a fixed block and down to a runner block; rope 2 runs from the load over the runner and down to the hand. The runner is pulled down by both legs of rope 2 (2P) and held by rope 1, so rope 1 carries 2P; the load gets 2P + P: P = W/3.
- Here a pitch-Ø40 fixed block and a pitch-Ø20 runner; the two rope ends sit 30 mm apart on a load bar whose weight stem is on the line of the resultant (x = −10).
- Brown's No. 16 (Spanish barton). It is the 'third system' of pulleys with two sheaves: every rope ends on the load.
- Parts (each has its own page): tackle-beam-240-sockets, tackle-block-20-top-stem, tackle-block-10-top-socket, rope-sheave-3mm-pitch-40, rope-sheave-3mm-pitch-20, ropes-3mm-spanish-burton-single, tackle-weight-d40x40-socket, load-bar-40-sockets-m20-p10, dowel-pins-metric.
- Brown's movement No. 16 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
fixed block  pitch Ø40
runner  pitch Ø20
rope tensions  rope 1: 2P, rope 2: P
mechanical advantage  3

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. 16: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_016.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/spanish-burton-single-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=spanish-burton-single-mechanism