Large Brass Sector
- Sold for:
- Clocks, Watches & Scientific Instruments - 2502
- Date / Time :
- May 01, 2010 10:00AM
Large Brass Sector, possibly England, 19th century, the adjustable arm tightens with a thumbscrew, lg. 27 in.
Note: Crom #2 includes a few pages on sectors or "proportional gauges," tools which predate watchmaking but are used readily by watch and clockmakers to calculate the relative sizes of wheels and pinions.