Industry : a magazine devoted to science, engineering, and the mechanic arts, especially on the Pacific Coast (1888)
San Francisco : Industrial Pub. Co. · leaf 449
MINERAL STATISTICS. 431 … Fig. 3. The continual reduction of weight in proportion to power has been a principal mechanical feature in street railway motors. One horse power transmitted with 48 pounds of weight where 100 pounds were required but a short time ago, is certainly progress. Another feature to which attention may…
Industrial arts · Technology
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-401-275.webp)
