[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 216
lied toregular mining work in several leading mines. Agood electric rotary mining drill has been the miss-ing link in electric applications for mining work.This one is light, compact, simple and easy tooperate. The motor is completely encased, so thatit is impossible for dust, dirt or stray stones,… … ROTARY DIAMOND DRILL. RECEXT APPLICATIONS. . 215 The current for operating the drill is suppliedat a constant voltage or potential; the number ofvolts depending on the potential used for trans-mitting power throughout the mine. If lamps areneeded, they can be supplied with current from thesame main…
Electricity
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