This week’s artifact might familiar to some. It’s a slide rule conversion tool for the metric system. Anyone else have one these lying around? This one belonged to Fred Davis, who worked on the Great Lakes.
Find more information and other artifacts like this one on eMuseum.
I have one of these converters as well copyrighted in 1974. Mine is slightly different where one side has AREA, VOLUME, and MASS. The other side has CAPACITY, LENGTH, and a TEMP conversion scale. I acquired it at the time of the copyright and have kept it all this time.