Geometry & Design: Practical Subdivision with a Sector and Related Devices
Channel: Plan B Workshop
Date: 29/03/2020

We explore, in detail, the use of a sector and the related straightedge - layout square - ruler in order to divide segments into equal parts, divide them into two parts that satisfy a rational relationship, construct a sequence of segments that are continuously proportional, and divide a segment into a sequence of segments that are continuously proportional. Having a sector in hand would be particularly useful for following along with this video.  Below, I've included links to some places where you can get one for your own use. 

1. Jim Tolpin and George Walker offer a printable sector on their site "By Hand & Eye": https://www.byhandandeye.com/product/...
2. First Light Works has also made a printable paper sector available for free: https://www.firstlightworks.co.uk/pos...
3. Acer-Ferrous Toolworks has a professionally constructed, full sized layout sector available for sale.  It might be worth considering if you are wanting to go all in on pre-industrial design: https://redrosereproductions.com/sector/