Each pile after the first is given ten minutes in the washing machine. On Tuesday the ironing is done with electric irons (Fig. 144). On Friday the house is cleaned by the vacuum cleaner, run by electricity (Fig. 145). [Illustration: Fig. 144] [Illustration: Fig. 145] On Saturday a lot of baking is done in a series of fireless cookers (Fig. 146). The sewing machine runs more than ever before. I hear "It is such fun to sew with an electric motor." And the electric fan which Harold installed for his mother over the sewing machine "makes that the coolest spot in the house." [Illustration: Fig. 146] [Illustration: Fig. 147] Chores do not take all of the time, nor most of the time. They are simply the important things which must be done right on time. Meanwhile there is plenty of time for other things and a vast lot of experimenting goes on down at the mill. It is my chief entertainment to stroll down there every day and look on. One day I found this project on trial: On the floor (Fig. 148, _f_) of the room over the wash room at the mill a large dripping pan _A_, was set on blocks of wood so that one corner was lower than the rest. A rubber pipe, _B_, brought water to this pan from the mill pond, an inverted faucet, _c_, regulating the flow. The overflow from the pan fell into a funnel, _d_, the stem of which went through a hole in the floor. A short piece of rubber pipe connected this with the nozzle, _e_, of a gardener's sprinkling can, which hung from the ceiling in the compartment for the shower bath. Electric lamps attached to a board, _g_, were inverted over the pan of water, so that the bulbs of the lamps were immersed in the water. The electric current for these lamps was controlled by a switch, _h_, placed by the side of the water faucet. When one wanted a shower he could have it as cold or as hot as he chose by adjusting properly the switch and the faucet. Moreover, it was not necessary for him to wait, for warm water flowed immediately. [Illustration: Fig. 148] In discussing this the boys said that a 32-candle-power lamp used 110 watts, and that since 96 per cent. of the energy supplied to the lamps went into heat each lamp transformed 105 watts of electrical energy into heat. But 100 watts sufficed to raise one pint (one pound) of water five degrees in one minute. They used seven lamps or about one horse-power, and adjusted the flow so that the shower delivered one quart of lake water per minute warmed for a tepid bath. [Illustration: Fig. 149]