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I have devised a small blood lancet as shown in the illustration. It is small, and solidly set in a steel case with a screw-top protecting cover. It has proved efficient for drawing an adequate droplet of blood from the ear or finger tip. It costs twenty-five cents—half the amount of the instrument usually used for this purpose. It will easily fit into any hemacytometer case, and is convenient to carry in the vest pocket.
Stein IF. A NEW BLOOD LANCET. JAMA. 1917;LXIX(5):383. doi:10.1001/jama.1917.25910320001016