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The following method is suggested as a help to more accurate results with the Gower, Sahli and Haldanes hemoglobinometers. So far as I know it has not been otherwise described or used.
The beginner will frequently have trouble in determining the exact point when the dilution tube reaches the standard color. This difficulty is due partly to reflections and the lens effect of the tube as well as to distractions of the surroundings and is, of course, increased in those having a defective color sense.
I suggest the use of two mailing tubes 2½ inches in diameter and 14 inches long, coated black on the inside and one end covered (the objective) with black paper having a pin-hole orifice centrally located. Three inches back from this end, in each mailing tube, an opening is made which will just permit the standard and dilution tubes to enter at right angles (see illustration).
REASONER MA. A HELP TO HEMOGLOBIN DETERMINATION.. JAMA. 1907;XLIX(24):2007. doi:10.1001/jama.1907.25320240043003e
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