Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 110
e of the center circles. Fig. 13plainly shows the construction of the dial. It will be notedthat it is sectional, having twelve separate sections boltedtogether, that is, for the hour sections. The minute sectionsare also twelve and external to the hour sections. Thewhole is thoroughly braced and…
Science · Technology · Meteorology · Patents
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