Vashon, George S., & co., Washington, D.C. [from old catalog] · Washington, D.C., G. S. Vashon & co. · leaf 49
91 MECHANICAL MOVEMENTS Patents Guaranteed. 49 60. A rotary engine. This engine lias two abutments and two inlet andexhaust ports. 61. A horsepower tread wheel. The horse is placed below the shaft andbetween the spokes which are arranged at the sides of the wheel. 62. A four-way cock. 63. A swape,…
Patents · Inventions
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-441-291.webp)
