Harper's boating book for boys; a guide to motor boating, sailing, canoeing and rowing . s-enginesare cast double, with a space between the two thicknessesof metal where water can circulate and cool them off. (SeeA in Fig. i). This is easy because there is always plentyof water available, around a boat. On land it is customaryto use air-cooled motors, in which the head of the cylinderis cast with many thin ribs to increase the cooling surfaceand permit as much radiation of this heat as is possible.(Fig. 3). The appearance of a marine engine is shown inFig. 2. A two-cycle engine explodes its ch
Harper's boating book for boys; a guide to motor boating, sailing, canoeing and rowing . s-enginesare cast double, with a space between the two thicknessesof metal where water can circulate and cool them off. (SeeA in Fig. i). This is easy because there is always plentyof water available, around a boat. On land it is customaryto use air-cooled motors, in which the head of the cylinderis cast with many thin ribs to increase the cooling surfaceand permit as much radiation of this heat as is possible.(Fig. 3). The appearance of a marine engine is shown inFig. 2. A two-cycle engine explodes its charge much oftenerthan a four-cycle one, and the concussion is not so , for small boats the two-cycle is generally preferred. Ignition The ignition, or means of exploding the gas, also is pro-vided for in two ways: one is called the make-and-break(Fig. 4); the other the jump-spark ignition (Fig. 5). Inboth cases the electricity is led in through the head of thecylinder by insulated plugs. In the make-and-break sys-tem a low power of electricity is used and a movable arm 240.
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Keywords: ., bookcentury1900, bookdecade1910, bookidharpersboati, bookyear1912
