h of the two sets of three-cylinder air pumps. rents of the kind produced when a microphone is Similar experiments with equally satisfactory results In the same pump room are located two direct-con- spoken into. To this effect he inserted a coil sur- were made on different alternating-current… … industry has, in conjunc- when desired, and the op- A NEW ELECTRIC TBAVELING SCALE CBANE. eration thereafter is the tion with representatives same as with an ordinary trolley. of that industry, drawn up a scheme for the formation circuit of a microphone. The sounds pronounced in It will be seen…
Plaster · Mold · Center · Bounding · Boiled · Gatun · Pedro miguel · Scientific American · Plaster sides · Iron core · Final positions · American july · Square abcd · Stove pipe · Cubic yards · Plaster mold
Internet Archive · Public domain (published before 1931). Free to use for anything.
