Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 109
ovement, which we have just described, in its case at theVol. CLI. No. 902. 7 98 Johnson : [J. F. I.. bottom, with the vertical shaft at the side opposite the cen-ter of the dial, which shaft, by miter gears, connects with thehorizontal shaft of the minute hand. Jig. 12 is a larger, but, of course,… … Fig. io.—Plan view of dial room. to the shaft 7n, so as to register them with the minutemarks. This adjustment is, of course, only performedonce. The dials are the largest in the world, having a diameterof 25 feet across the centers from the extreme edges. Fig.IJ is taken from a photograph made…
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