. Science of railways . Joyce Rapid MovingScrew Jack. Fig Norton Bali-Bearing RatchetScrew Jack. hold of the lever. To lower it-take hold of one of thehandles with the left hand, and inclining the jack toan angle of about forty-five degrees, with the otherhand holding the lever, let the screw down. The jack shown in Fig. 4 has a stationary standardand a sliding sleeve fitting over the same. Thestandard has a removable nut (usually phosphor-bronze) fitted within it and resting on a shoulder, inwhich the screw turns. The standards are hollow and LOCOMOTIVE APPLIANCES 65& can be filled with oil,
. Science of railways . Joyce Rapid MovingScrew Jack. Fig Norton Bali-Bearing RatchetScrew Jack. hold of the lever. To lower it-take hold of one of thehandles with the left hand, and inclining the jack toan angle of about forty-five degrees, with the otherhand holding the lever, let the screw down. The jack shown in Fig. 4 has a stationary standardand a sliding sleeve fitting over the same. Thestandard has a removable nut (usually phosphor-bronze) fitted within it and resting on a shoulder, inwhich the screw turns. The standards are hollow and LOCOMOTIVE APPLIANCES 65& can be filled with oil, thus keeping the screw con-stantly lubricated. To the upper end of the screw isfastened a steel gear; a hardened tool steel plateencircles the hub, and rests on the body of said gear,on which are placed circular trains of hardened steelballs, held in place by rings between the rows (asshown in the cut). In the top or head of the slidingsleeve, which is bored to fit standards, is placedanother hardened tool steel pla
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