This engraving, [Fig. 100], shows the counter of the Meter. It registers cubic feet—one cubic foot being 748⁄100 U. S. gallons and is read in the same way as the counters of gas meters.
Fig. 100.
The following example and directions may be of service to those unacquainted with the method:
If a pointer be between two figures, the smallest one must always be taken. When the pointer is so near a figure that it seems to indicate that figure exactly, look at the dial next below it in number, and if the pointer there has passed 0, then the count should be read for that figure. Let it be supposed that the pointers stand as in the above engraving, they then read 28,187 cubic feet. The figures are omitted from the dial marked “ONE,” because they represent but tenths of one cubic foot, and hence are unimportant. From dial marked “10,” we get 7; from the next marked “100,” we get 8; from the next marked “1,000,” we get the figure 1; from the next marked “10,000,” the figure 8; from the next marked “100,000,” the figure 2.
The Fish Trap used in connection with water meters is an apparatus (as its name denotes) for holding back fishes, etc.
THE STEAM BOILER INJECTOR.
For safety sake, every boiler ought to have two feeds in order to avoid accidents when one of them gets out of order, and one of these should be an injector.
This consists in its most simple form, of a steam nozzle, the end of which extends somewhat into the second nozzle, called the combining or suction nozzle; this connects with or rather terminates in a third nozzle or tube, termed the “forcer.” At the end of the combining tube, and before entering the forcer, is an opening connecting the interior of the nozzle at this point with the surrounding area. This area is connected with the outside air by a check valve, opening outward in the automatic injectors, and by a valve termed the overflow valve.