Electronic enthusiasts that need to measure angles on their robotic arm or other projects may be interested in a new proximity sensor that has been created by William Moore called the Protractor. The ...

Use a ruler, protractor and a pair of compasses to construct a triangle accurately. After the triangle has been constructed, leave the construction lines visible so each stage of the process is shown ...

A theoretical astrophysicist uses his protractor to measure the universe. From a sheet of paper to the cosmos. Lots of pictures! This post is from Observer Short List—an email of three favorite things ...