OF THE VARIOUS SIZES REQUIRED,

_Parts connected with Railroads, including Frogs, Switches, Chairs and

Hand Cars._

MACHINISTS' TOOLS, of all descriptions, including _TURNING LATHES_, of

sizes varying from 6 feet to 50 feet in length, and weighing from 500

pounds to 40 tons each; the latter capable of turning a wheel or pulley,

_thirty feet in diameter_.

Smithsonian Institution - United States National Museum - Bulletin 240 Contributions From the Museum of History and Technology Papers 34-44 on Science and Technology · 第 244 / 318 题