U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 423
with a gravitating weight, all located insaid tube, the arrangement being such thatmovements of the weight alternately sepa- 80rate and connect said electrodes, as set forth. In testimony whereof I have signed myname to this specification, in the presence oftwo subscribing witnesses, this 30th day…
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-1113-496.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-465-205.webp)
