Electric signaling system, Ross shaft, Homestake Mining Co
The horn cases are made of cast iron and are so constructed that they serve also as junction aquot;boxes for the conduit and wiring system. They have knohs in them for holding the vertical wires. The pull switches are located out on the stations inanbsp;...
| Title | : | Electric signaling system, Ross shaft, Homestake Mining Co |
| Author | : | John F. Wiggert |
| Publisher | : | - 1937 |
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