. The Dental cosmos. the tubing should be removed. Aftermaking sure that there are no air-bubbles,the pycnometer is placed in a beaker ofwater sufficiently heated to bring thetemperature to ° C. It is then wipeddry on bibulous paper and waved in theair once or twice to insure further dry-ness. The saliva is then drawn downby a bit of absorbent material, touchingthe capillary end of the tube, until thebottom of the meniscus is exactly on thegraduated mark. It is then weighed inthe balance and the specific gravity foundaccording to the formula— Wt filled with saliva — wt in air _ ^ Wt with d
. The Dental cosmos. the tubing should be removed. Aftermaking sure that there are no air-bubbles,the pycnometer is placed in a beaker ofwater sufficiently heated to bring thetemperature to ° C. It is then wipeddry on bibulous paper and waved in theair once or twice to insure further dry-ness. The saliva is then drawn downby a bit of absorbent material, touchingthe capillary end of the tube, until thebottom of the meniscus is exactly on thegraduated mark. It is then weighed inthe balance and the specific gravity foundaccording to the formula— Wt filled with saliva — wt in air _ ^ Wt with disk H,0 — wt in air P* g* A small suction filter that is very use-ful is sufficiently described by the photo-graph ; it is designed for connection withthe saliva ejector. Small funnels, etc.,are also shown. THE VISCOSIMETER. The specific gravity found, the pyc-nometer is next attached to the viscosi-meter, as shown in Fig. 3. This consists Apparatus for storing volumetric solutions. piece of rubber tubing. The
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
