Slide rule - 1956 30 of 51
This one is 6 inches long, with magnifier to give more accuracy.
Machine inscribed, not moulded.
Results were accurate to 2 significant figures, 3 if you're lucky!
Every science and engineering student needed one.
Image 1956-SlideRule1193.jpg
Photo page created Fri Dec 2 08:36:44 2005. All information © Eric Foxley.