This apparatus can also be used as an air bath, in which case the
vessel, B, is left empty and closed by a suitable stopper.
* * * * *
PIPETTE FOR TAKING THE DENSITY OF LIQUIDS.
The accompanying engraving represents a simple apparatus, which any
person accustomed to working glass can make for himself, and which
permits of quickly, and with close approximation, estimating the
density of a liquid. In addition, it has the advantage of requiring
but a very small quantity of the liquid.
It consists simply of a straight pipette, A B, to which is affixed
laterally, at the upper part, a small U-shaped water gauge.
The two branches of the gauge, as well as the pipette itself, are
graduated into equal divisions. If need be, the graduating may be done
by simply pasting on the glass strips of paper, upon which a graduated
scale has been drawn. The zero of the pipette's graduation is exactly
at the lower extremity, B. The graduation of the two gauge tubes
extends in both directions from a zero situated near the center. The
zeros of the two branches must correspond as exactly as possible, so
that they shall be in the same horizontal plane when the apparatus is
fixed upon a support. To render the apparatus complete, it only
remains to adapt, at A, a rubber tube provided with a wire clamp, and
terminating in a short glass tube for sucking through with the mouth.
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