Elements of experimental and natural philosophy : being a familiar and easy introduction to the study of the physical sciences; embracing animal mechanics, pneumatics, hydrostatics, hydraulics, acoustics, optics, caloric, electricity, voltaism, and magnetism / by Jabez Hogg.

  • Hogg, Jabez, 1817-1899.
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: Elements of experimental and natural philosophy : being a familiar and easy introduction to the study of the physical sciences; embracing animal mechanics, pneumatics, hydrostatics, hydraulics, acoustics, optics, caloric, electricity, voltaism, and magnetism / by Jabez Hogg. Source: Wellcome Collection.

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    attached to the bent lever e, it moves the lower end, to which Fig. there is a catch backward, bj- which motion tlie pin / is re- leased. The wheels being at liberty, and acted upon by a main spiing, they whirl round and give motion to a hammer that strikes the bell g. On the left of e there is a slight spring that reacts on the lever and restores it to its position when the att]'action of the electro-magnet ceases, and causes the catch again to hold the pin /. As soon as the attendant ariives at the dial to which his attention is called, his first care is to stop the noise of the bell,