Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 107
vement taking place of the anchor /-/,pawls r and s fall into the teeth of the wheel on the oppo-site side from the anchor. There are two of these pawls,so that one locks at one-half of a minute and the other atthe other half minute. While the piston t is pressed for-ward by the air pressure, it is… … Fig. 9. —Vertical section of tower. FiG. 11.—Cross-section of dial, etc. Feb., 1901.] Philadelphia City Hall Clock. 07- shows the same mechanism as in Fig. 7, only in elevation.It will be noted that a small dial is attached to the verticalshaft ;;/, so that the time maybe read from this mechanism.…
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