CHAS. LENTZ & SONS 
Blooa Cesting Instruments 
TAYLOR'S HAEMAGLOBINOMETER 
No. 2804 
2804. This apparatus was suggested to us by Dr. A. E. Taylor, of the 
Wm. Pepper CUnical Laboratory of the University of Pennsylvania Hospital. It 
consists of a fine capillary tube and mixing bulb with bead, similar to that supplied 
with the Zeiss Hjemacytometer, a glass wedge of gradually increasing depth of 
color (the same as is used with the Fleischl Haemometer), and a rectangular glass 
plate with a square raised platform in the center. This raised platform, which is 
cemented to the plate nearer to one side, has in its center a circular cavity or cell 
of exactly one millimeter in depth. The rectangular plate is accurately fitted in a 
metal frame sliding in grooves, so that the cavity with its contents, can be brought 
successively to any part of the wedge for color comparison. 
To use the apparatus a drop of blood is carefully drawn into the mixing tube 
up to the engraved mark, and distilled water is then drawn up till the bulb is en- 
tirely filled to the second engraved mark on the upper constricted end ; the diluted 
blood is then mixed (by means of the contained bead) by shaking the bulb. The 
portion remaining in the capillary tube is then blown out and discarded. A part 
of the diluted blood is then blown out into the cavity in the platform of rectangular 
plate until it is filled. A ground and polished square cover-glass (supplied) is placed 
on top and the contents of cell are compared with successive parts of the wedge by 
reflected light from the white background until the color, as seen through both nar- 
row rectangular diaphragms, agrees in depth, when the percentage of haemaglobin 
is indicated on the scale. 
This Hamaglobinometer presents direct improvements over the Fleischl 
instrument. The blood examined is of a known accurate dilution made with a 
pipette, which is very much greater in length than that employed in the Fleischl 
instrument, so there is less risk of inaccuracy. The quantity of the diluted blood 
to be compared with the Reichert wedge is constantly and accurately fixed 
by the use of a cell of one millimeter depth, somewhat similar to the cell employed 
in the Thoma Haemacytometer. Another advantage of this instrument over the 
Fleischl is its portability ; it can be closed and easily carried in the pocket, being 
about the same size as the case of the smaller Thoma Haemacytometer. 
The capillary pipette supplied allows of a dilution of i-io or 1-20. 
Price $30 00 
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