“The economy in space required is also worthy of consideration. The driving mechanism of a modern electric pumping outfit occupies a small amount of room and the space required for wiring is negligible. In case of accident, any mechanical injury to wires can be quickly and easily repaired--thus the economy in time and expenditure for repairs. There is no large loss by condensation. The only loss sustained with the electric system in the transmission of power is a small loss due to line resistance, increasing directly with the amount of water being pumped and ceasing entirely when the pump is not in operation.” A well designed electric pump will give an efficiency of from 75 to 80 per cent.; and, as the transmission loss depends upon the weight of copper in the transmission line it can be made as low as the cost of power, and, 2, the investment in copper will warrant. DIRECTIONS FOR INSTALLATION. 1. It is important to locate the electric pump where it will be dry and clean and where it will be thoroughly accessible for proper care. 2. No pipes should be allowed to pass above the electric motor where liquids are likely to drip upon it. 3. The suction or supply pipe must be as short and straight as possible and must be air tight, as air entering the pump through the suction reduces its capacity or prevents it from working altogether. 4. A tight foot valve and a strainer should invariably be used on the bottom end of the suction pipe when the water is to be lifted from 8 ft. to 10 ft. below the pump. Where the lift is excessive or for any reason the supply be limited, an air chamber placed on the suction pipe near the pump will prove beneficial in preventing slamming of the valves. 5. Provision should be made for draining both pumps and pipes in cold weather by a proper application of frost cocks. 6. If the electric pump is kept _dry, clean and well oiled_, it will prove the most desirable and least expensive apparatus to be had for the service. 7. Ascertain the nature of electric current to be used. Direct or alternating? Voltage? (If alternating, note phase and number of alternations.) 8. Also record any unusual or peculiar circumstances connected with the installation or operation of the apparatus; and if so, what? DOMESTIC ELECTRIC PUMPS. [Illustration: FIG. 238.] [Illustration: FIG. 239.]