ne, or the ordinary windmill. The water wheel is the ideal prime
mover for the dynamo in isolated plants. Since water-power is running
to waste on tens of thousands of our farms throughout the country,
several chapters are devoted to this phase of the subject: these
include descriptions and working diagrams of weirs and other simple
devices for measuring the flow of streams; there are tables and
formulas by which any one, with a knowledge of simple arithmetic, may
determine the power to be had from falling water under given
conditions; and in addition, there are diagrams showing in general the
method of construction of dams, bulkheads, races, flumes, etc., from
materials usually to be found on a farm. The tiny unconsidered brook
that waters the farm pasture frequently possesses power enough to
supply the farmstead with clean, cool, safe light in place of the
dangerous, inconvenient oil lamp; a small stream capable of developing
from twenty-five to fifty horsepower will supply a farmer (at
practically no expense beyond the original cost of installation) not
only with light, but with power for even the heavier farm operations,
as threshing; and in addition will do the washing, ironing, and
cooking, and at the same time keep the house warm in the coldest
weather. Less than one horsepower of energy will light the farmstead;
less than five horsepower of energy will provide light and small
power, and take the drudgery out of the kitchen.

For those not fortunate enough to possess water-power which can be
developed, there are chapters on the use of the farm gasoline engine
and windmill, in connection with the modern storage battery, as
sources of electric current.

It is desired to make acknowledgment for illustrations and assistance
in gathering material for the book, to the editors of _The Country
Gentleman_, Philadelphia, Pa.; The Crocker-Wheeler Company, Ampere, N.
J.; The General Electric Company, Schenectady, N. Y.; the Weston
Electrical Instrument Company, of Newark, N. J.; The Chase Turbine
Manufacturing Company, Orange, Mass.; the C. P. Bradway Machine Works,
West Stafford, Conn.; The Pelton Water Wheel Company, San Francisco
and New York; the Ward Leonard Manufacturing Company, Bronxville, N.
Y.; The Fairbanks, Morse Company, Chicago; and the Fitz Water Wheel
Company, Hanover, Pa.

TABLE OF CONTENTS

PAGE

INTRODUCTION