The Library of Work and Play: Electricity and Its Everyday Uses

mmer at the farm. I had the roof of an old mill reshingled and gave it to them for a camp. They were to make it over inside. I sen

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this room, they had cut a hole in the floor and nailed slats across upon the under side of the timbers, making a depressed floor for a shower bath. This was directly over a stream of water which issued from the mill pond. Hanging from the ceiling over this spot was the nozzle of a garden hose. The other end of this hose ran into the mill pond. The nozzle was capable of delivering either a stream or a shower, according to which

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n the nozzle of the shower, but knowing my antipathy for the cold bath they had slipped the end of the rubber hose over the outlet pipe of the pump which served to cool the

l than that one, coming, as it did, at th

d before escaped my notice, a miniature electric lamp, six-volt, two-candle-power, tungsten, such as are used for tail lights on automobiles. Since tungs

wire filament looked to be about 1.5 inches

5 ohms =

the next cell. This battery was placed on a shelf in a convenient place. A bare copper wire, No. 18, was attached to the carbon post at one end of the battery and another to the zinc post at the other end of the battery, and these two wires ran to all the rooms where lamps were placed. The wires were fastened up on the walls by staples, taking care that they should nowhere come in contact with each other and "short circuit" the battery. Whenever it was necessary for one wire to cross another, small pieces of pasteboard were tacked up to prevent thei

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re are five lamps, making a total of 250 lamp hours. Each lamp takes .4 of an ampere, making a

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that electricity costs fifty times as much if generated by battery as by dynamo. In this case the bat

t much in voltage, but in the ability to furnish sufficient quantity in amperes to make the hot spark required for igniting the mixture of gasolene and air in an engine cylinder.

produced by a battery, but, on the other hand, we are never as economi

y would run down rather badly and would not fully recover. But if one only is used at a time and for not more than thirty m

nnected directly with the ammeter without other resistance, while the latter may give not more than six to ten amperes under similar conditions. For most purposes, other than igniting gasolene engines, in which dry cells are used, an exceedingly small current is required. The electric bell, for example, may not requir

at they intended to use this fine, large room for. They told me that they had plans for making a machine shop out of that. The idea had been suggested by a counter shaft which still hung

concerning the motor boa