The boys' book of engine-building; . ole through the centerof it and thread it to fit a /4-inch pipe. Now for the works: make an angle supportof a strip of brass %2 inch thick, % inch wideand 1% inches long; bend the edges as shown atB in Fig. 52 so that it stands % inch high; drilla hole in each end so that it can be screwed tothe back; drill a hole in the center for the pin,or arbor as it is called, on which the pinion, thatis a little cogwheel, is fixed inside the case andto the end of which the needle or pointer isscrewed outside the case. Drill another hole %2inch below the center and %2
The boys' book of engine-building; . ole through the centerof it and thread it to fit a /4-inch pipe. Now for the works: make an angle supportof a strip of brass %2 inch thick, % inch wideand 1% inches long; bend the edges as shown atB in Fig. 52 so that it stands % inch high; drilla hole in each end so that it can be screwed tothe back; drill a hole in the center for the pin,or arbor as it is called, on which the pinion, thatis a little cogwheel, is fixed inside the case andto the end of which the needle or pointer isscrewed outside the case. Drill another hole %2inch below the center and %2 inch to the left of itfor the pin on which the toothed wheel turns; Fittings for Model Engines 133 and, lastly, drill a hole at the top and to the left,put in a pin and fix a flat spring to it. Get a piece of pinion wire,1 that is a ribbedwire used by clockmakers for making small pin-ions, or toothed wheels of any length, and cutit off Vs inch long, or you can use a small pinion SUPPORTTOOTHEP COMPRESS SP/ZAL SPRING-lug BR/tSSPL/PTE. £/)CK~ ii NEEDLE CFRONTPLATE RING ORD/4L SIPHON flT£H Fig. 52. How a Steam Gauge is Made taken from an old clock. Set it on a steel wireVie inch thick and %e inch long, thread both endsof the wire, or arbor, push the short end throughthe support and screw on a nut; and see to it thatit runs very true. Take another clock wheel, or buy a new toothed 1 Can be bought of dealers in model makers supplies. 134 The Boys Book of Engine-Building wheel %6 inch in diameter, drill a hole in two ofthe spokes % inch from the center and fix a pinin each one of them. To make the pressure rodsharpen one end of a piece of He-inch wire %inch long; flatten the other end and drill a holethrough it, and also flatten it at a point Vie inchabove the pointed end, drill it and fix a bit ofwire in it for a stop for the spring. Now pivotthe connecting rod to the toothed wheel and slipthe rod through the hole in the bottom of thering; then pivot the wheel to the support andsc
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Keywords: ., bookcentury1900, bookdecade1910, bookpub, booksubjectsteamengines
