Above each
large dial is an arrow that points out the direction in which to read,
the two outside ones reading toward the right and the center one toward
the left; also, above each dial is lettered the quantity of gas that
each dial registers, that at the right registering 1,000 cubic feet,
that in the center 10,000 cubic feet, and that at the left 100,000 cubic
feet. To read the dials, begin at the left, or the 100,000 dial, and
read toward the right. In each instance, read the number over which the
hand has passed last. For instance, when, as in Fig. 1, the hand lies
between 5 and 6 on the left dial, 5 is read; on the center dial, when
the hand lies between 5 and 6, 5 is read also; and on the right dial,
when the hand lies between 2 and 3, the 2, which is really 200, is read.
57. To compute the quantity of gas used, the dials are read from left to
right and the three readings are added. Then, in order to determine the
quantity burned since the previous reading, the amount registered at
that time, which is always stated on the gas bill, must be subtracted
from the new reading.
To illustrate the manner in which the cost of gas consumed may be
determined, assume that gas costs 90 cents per 1,000 cubic feet, that
the previous reading of the gas meter, say on May 15, was 52,600 cubic
feet, and that on June 15 the meter registered as shown in Fig.
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