This may be
accomplished by a peculiar kind of stop-cock--which will, at
each opening, discharge only a certain measure of fluid the
number of times the cock has been turned being registered by a
counting apparatus accessible only to the master.
69. The time and labour consumed in gauging the contents of
casks partly filled, has led to an improvement which, by the
simplest means, obviates a considerable inconvenience, and
enables any person to read off, on a scale, the number of gallons
contained in any vessel, as readily as he does the degree of heat
indicated by his thermometer. A small stop-cock connects the
bottom of the cask with a glass tube of narrow bore fixed to a
scale on the side of the cask, and rising a little above its top.
The plug of the cock may be turned into three positions: in the
first, it cuts off all communication with the cask: in the
second, it opens a communication between the cask and the glass
tube: and, in the third. It cuts off the connection between the
cask and the tube, and opens a communication between the tube and
any vessel held beneath the cock to receive its contents.
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