[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 208
the most extensively used vacuum pumpfor this class of work is the Packard Vacuum Pump,built by Mr. Norman Hubbard, of 93 Pearl Street,Brooklyn, N. Y. Our engraving, Fig. 4 showsthe No. 4 pump, and as will be seen, the cylindersare placed vertically in a cast-iron box which servesas a bed plate and… … FIG. 4.—THE PACKARD VACUUM PUMP FOR EXHAUSTINGINCANDESCENT LAMPS. The suction pipes are connected at the bottom ofthe jacket by means of ground unions which are PECENT APPLICATIONS. 207 provided with traps to arrest any mercury or dirt,and the exhausts are piped to a pot which acts asa trap to…
Electricity
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