Behold the Sector
...out the divider on the workplace. In addition to carpentry the sector was used in navigation, surveying and gunnery. With your handy sector you can also solve multiplication and trigonometry problems. The sector’s invention is attributed to either Galileo Galilei and/or Thomas Hood sometime in the 16th century. If you’re a teacher or a parent looking for a geometry lesson to do in quarantine Jim Toplin has a free paper sector plan you can downloa...