Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 103
ht at the end of the shorter. Anexcess of half an inch in the length of the arm of the beam,to which merchandise is attached, where the arm should beeight inches long, would cheat the buyer exactly one ounce in every pound.This fraud, if suspected, might be detected instantly, by transposing… … What is the 212. Platform scales, and scales intendedconstrucu™^ for wciglilng hay, etc., are usually compoundscales? levers, and are constructed in very various forms, but all depend on tlie principles above explained.Iig. 69 represents one of the varieties, and Fig. 70 a sec- FiG. 70.
Physics · Science · Technology
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