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To obtain good pulse waves from a polygraphic apparatus, the simplest method thus far devised is to use a glycerin capsule; i. e., the cup that is applied over the radial pulse is covered with two layers of rubber dam, between which is an amount of glycerin sufficient to bulge the membrane.
The apparatus can be made very simply at a cost of not more than 50 cents. All that is required is a thistle tube made of thick glass. This can be obtained for 15 cents at any chemical glass house. Over this is stretched one layer of thick rubber dam held in place by a rubber band. Suction is made and glycerin poured into the cup formation. Another piece of rubber dam is carefully put over this and firmly tied by another rubber band. A strap is made of a piece of. elastic tape cut so as to
Kahn MH. A SIMPLE, CHEAP, EFFICIENT GLYCERIN CAPSULE FOR POLYGRAPH. JAMA. 1925;84(3):203. doi:10.1001/jama.1925.26620290002018a
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