[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 209
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… … FIG. 5—THE PACKARD VACUUM PUMP FOR EXHAUSTINGINCANDESCENT LAMPS. The valve motion is on the principle of the well-known Ritchie valve gear, but containing none ofits complication. All the valves are opened andclosed automatically, not requiring an air pressurebelow them to do this work. The main…
Electricity
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