Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . ro; thatis, all the pointers stand at 0, and the registration begins all overagain. Prepayment Meters.—In many places it is desirable to sellgas in small quantities and to prepay the amount for a given supply of gas. This is accomplished bya meter such as that of Fig. 179. Themeter is constructed much the same as theformer but provided with a mechanismsuch that when a coin—usually 25 cents—is deposited, according to the printeddirections in the instrument, an amountof gas represent
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . ro; thatis, all the pointers stand at 0, and the registration begins all overagain. Prepayment Meters.—In many places it is desirable to sellgas in small quantities and to prepay the amount for a given supply of gas. This is accomplished bya meter such as that of Fig. 179. Themeter is constructed much the same as theformer but provided with a mechanismsuch that when a coin—usually 25 cents—is deposited, according to the printeddirections in the instrument, an amountof gas representing the proportional cur-rent rate is allowed to pass the supply is cut off as soon as theamount paid for is used; when in orderto receive more gas, another coin must bedeposited as Rules.—The rules for the regulation of gas serv-ice are in many States under the control of a board or commis-sion whose duty it is to form codes prescribing the measurementand sale of all public utilities. The following form. GeneralOrder No. 20, State Public Utilities Commission of Illinois,. Fig. 179.—The prepay-ment gas meter. GASEOUS AND LIQUID FUELS 257 gives an idea of the requirements in that State for the sale ofcoal gas. Rule 3. Request Tests.—Each utility furnishing metered service shallmake a test of the accuracy of any meter, upon written request by a con-sumer: Provided, first, that the meter in question has not been tested by theutility or by the commission within 6 months previous to such request;and second, that the consumer will agree to accept the result of the testmade by the utility as determining the basis for settling the differenceclaimed. No charge shall be made to the consumer for any such test. Areport, giving the result of every such test, shall be made to the consumer. Rule 4. Adjustment of Bills for Meter Error.—If on any test ofa service meter, either by the utility or by the commission, such meter shallbe found to have a perc
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