Publisher's Synopsis
Excerpt from Manual of Pharmacy and Pharmaceutical Chemistry: Designed Especially for the Use of the Pharmaceutical Student and for Pharmacists in General
The Knife-edges of a balance are the sharp points (made either of steel or agate) which act as bearings for the beam. They are three in number, two of which are known as Points of Suspension, - the points at each end of the beam, from which the pans are suspended; and one, the Point of Support, - the point at the middle of the beam which supports it upon the upright.
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