A 1930s high school class making electrical calculations on their slide rules. Note the demonstration-sized rule hanging on the blackboard. Keuffel & Esser Co., Drawing Instruments and Materials for ...

You have to really like slide rules to build your own ... If you’ve ever tried to manually draw an axis using a computer program — attempting to automatically set reasonable tick marks ...

Musicians simply must know their scales and he came up with a papercraft slide rule for major and minor scales. The system is very easy to use. He’s uploaded PDF files that let you print out the ...

AG Thornton was established as a manufacture of drawing instruements when it took over the Precision Instrument Co in 1901. This merger added a range of PIC slide rules to their range. the plastic ...

A 1930s high school class making electrical calculations on their slide rules. Note the demonstration-sized rule hanging on the blackboard. Keuffel & Esser Co., Drawing Instruments and Materials for ...