. American engineer and railroad journal . 542 THE AMERICAN ENGINEER [November, 1893. movement toward the left will thus cause the drum A to re-volve. A helical spring S, fig. 6, is wound around the shafta a and attached to it at one end. and to a sleeve F, winch to the stand /? h}- a screw G at the other end, andconsequenlly tlie tension of the spring causes the drum tomove backward after the twine <• is rclaxcii. The action ofthe drum is, in fact, exactly like that of the drum of an indicator. .A pap?r is wouuil around the drum luid is lield fast bythe claAips E[K, fig. 7, as
. American engineer and railroad journal . 542 THE AMERICAN ENGINEER [November, 1893. movement toward the left will thus cause the drum A to re-volve. A helical spring S, fig. 6, is wound around the shafta a and attached to it at one end. and to a sleeve F, winch to the stand /? h}- a screw G at the other end, andconsequenlly tlie tension of the spring causes the drum tomove backward after the twine <• is rclaxcii. The action ofthe drum is, in fact, exactly like that of the drum of an indicator. .A pap?r is wouuil around the drum luid is lield fast bythe claAips E[K, fig. 7, as on an ordinary steam-engine indi-cator. The tjinsion of the spring can be varied at will b}-turning the sleeve F. which is provided with six holes, asshown in fig 7, to receive the screw G, by which the sleevecan be fastened in an_y desired position, to give the requiredtension to the spring. Above the drum .1. tigs. 2 and 6, a sliding bar//is arrangedto move in a guide ff.* One end of this bar has a jiencil p, andat the other end it is
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
