Nice vintage cardboard sliding English/Metric Conversion Calculator used for conversion of inches to cm, ounces to gallons, Liquid, Volume, Length, Area Equivalency Chart Case. 1970s antique made in USA collectible office and school tools and supplies item ready to be shipped across North America. Contact us for international shipping..
In 1975 Canada went from imperial to metric and slide rules like this were a popular way to figure out the conversion. Fun fact – April 1, 1975 was the first day weather reports gave temperatures in degrees Celsius, rather than Fahrenheit. This chart converts measurements used for:
-Volume – cubic inches to cubic cm, cubic yards/feet to cubic metres
-liquids – gallons to litres, ounces to cubic cm
-Weight – ounces to grams, Kg to pounds
-Length – inches to cm/mm, yards/feet to meters, miles to km
-Area – square inches to square cm, square yards/feet to square metres, square miles to square km