The supply-pipe should be connected with the main supply just after the water meter.
The water meter (Fig. 159) is a device for measuring the number of gallons or cubic feet of water which pass thru a pipe.
Electric meters read in kilowatt hours, just as a water meter reads in gallons and a gas meter in cubic feet.
In 1807 Mr. Clegg first used lime as a purifier and in 1815 he patented the water meter.