File:Harper's boating book for boys; a guide to motor boating, sailing, canoeing and rowing (1912) (14776425114).jpg

Identifier: harpersboatingbo01davi (find matches)
Title: Harper's boating book for boys; a guide to motor boating, sailing, canoeing and rowing
Year: 1912 (1910s)
Authors: Davis, Charles G. (Charles Gerard), 1870-1959, ed
Subjects: Boats and boating
Publisher: New York, London, Harper & Brothers
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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like a big piece of round pipe standing up on end asshown by letter A in the illustration of a make-and-breakmotor (Fig. i).* That is the cylinder, and the bottom ofit, B, is called the base, the top of it, A, the head. Through this casting near the base goes the shaft (F),with a big, heavy fly-wheel (E) on one end and a placeto add on more shafting at the other (F). All the rest ofthe wheels and oil-cans and faucets you see are the fittings.C is the by-pass where the gasolene vapor ascends from thebase up past the piston. Some engines have the heads and sides of the cylindersall cast in one piece, as shown in the accompanying illustra-tion; but others have the heads bolted on separately. Ifyou were to take off this head and look inside you wouldonly see a polished, smooth surface like the inside of a gun-barrel. If you turn the fly-wheel over you will see the top * If any of these terms are not clear, consult the Dictionary of TechnicalTerms in the Appendix. 229 BOATING BOOK FOR BOYS
Text Appearing After Image:
Fig.t of the piston slide up and down like the plunger of a pump.This piston takes the pressure as the gases expand uponbeing ignited. It is shaped like a tin-can upside down, andlooking in from the top you see the bottom of the can-shapedpiston. Across the inside of this piston there is a steel pinon which is hinged the steel arm which reaches down andgrasps the shaft just where it is bent in a U, thus forminga crank by which the shaft and the fly-wheel are turned. 230 THE GASOLENE-ENGINE This steel arm is called the connecting-rod. The piston,connecting rod, shaft, and fly-wheel are the principal mov-ing parts of an engine, and all, except the fly-wheel, areout of sight inside the engine. Another moving part is a small steel shaft that is workedup and down by an eccentric on the shaft just behindthe fly-wheel. This works not only the sparker (M), butalso another rod (Q), which acts as a pump-plunger topump the circulating water that keeps the head of the en-gine cool. The Make-and-b

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