Bruning 2401* 5in Slide Rule and Leather Case F*S Mid Century This machine is ready to

This machine is ready to type

When the rocker is released the needle remains clamped in place making transfer of the reading to the "computer" ring much easier

this book also offers an incisive narrative of the history of astronomy and an evocation of what we see when gazing at the stars

I have owned this machine for ~30 years and used it regularly for optical coating and thin-film thermal evaporation

There are 6 covered access ports 6x13”

Bruning 2401* 5in Slide Rule and Leather Case F*S Mid Century This machine is ready toBruning 2401 5in Slide Rule and Leather Case Really neat and very practical 1960s 5 inch plastic rule #2401 Simplex With Bruning Leather Slipcase. 5" scale, with 6" total length. Scales on both sides of the center post. Front Scale 12. 5cm A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Leather slipcase is unmarked, Made in the USA FREE standard shipping to the 48 contiguous United States