. The steam-engine and other heat-motors. * Tabor Indicator.—Fig. 28 illustrates the method of making apencil-point describe a straight line when the pencil is attached. Fig. 28. Fig. 29. to a lever that tends to describe a circular arc. A stationary!!plate in which is a curved slot is firmly secured in an upright posi-1tion to the cover of the steam-cylinder (or on the outside spring-1indicator to a bracket on the steam-cylinder). On the pencil-bar, * Quotations from The Tabor Indicator. STEAM-ENGINE INDICATOR AND ITS CALIBRATION 53 is a roller-bearing which is secured to the bar by a pin. Th
. The steam-engine and other heat-motors. * Tabor Indicator.—Fig. 28 illustrates the method of making apencil-point describe a straight line when the pencil is attached. Fig. 28. Fig. 29. to a lever that tends to describe a circular arc. A stationary!!plate in which is a curved slot is firmly secured in an upright posi-1tion to the cover of the steam-cylinder (or on the outside spring-1indicator to a bracket on the steam-cylinder). On the pencil-bar, * Quotations from The Tabor Indicator. STEAM-ENGINE INDICATOR AND ITS CALIBRATION 53 is a roller-bearing which is secured to the bar by a pin. Thisroller moves freely in the curved slot in the guide upright andcontrols the motion of the pencil-bar. The position of the slotand guide upright i- so adjusted and the guide-roller is so placedon the pencil-bar that the curve of the guide slot controls thepencil motion and absolutely compensates the tendency of thepencil to move in a curve. The springs used on the Tabor indicators are of the duplextype, made of two coil- of wire fastened exactly opposite to eachother on the bases. Thi< arrangement equalizes the side strainon the spring and keeps the piston ce
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