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That need for so simple an agent still exists is proved by the multiplicity of home-made contrivances in the possession of laboratory workers and by the fact that an expensive sterilizable, metal affair recently introduced to the instrument market has twice the weight and dimensions desirable and yet provides for only two pipets.
My case has space for two bottles of diluting fluid, a small supply of cover-glasses for smears, and compartments for six pipets. Each of the last is held securely in position between rubber buffers, B and C, by the action of a strong spiral spring, A, which is capped with hard rubber cork, and anchored at the base of a cylindrical hole in the wood of the case. Pressure backward on this spring permits of the withdrawal or insertion of a pipet; and experience has shown that the contained fluid when carried in a tube, thus automatically
Graves GW. A POCKET-CASE FOR FULL BLOOD-PIPETS. JAMA. 1912;LIX(6):440. doi:10.1001/jama.1912.04270080122014