. The Bell System technical journal . Fig. 3—Telephotograph receiving machine. A-B-C-D- -Optical 554 BELL SYSTEM TECHNICAL JOURNAL. A NEW TELEPHOTOGRAPH SYSTEM 555 two bays of relay-rack-mounted apparatus, and a cabinet of powersupply equipment. A third bay comprising loop terminating arrange-ments, telephone, and loud speaker equipment may be furnished bythe telephone company if ordered by the customer. This telephoto-graph equipment connected by suitable circuits will transmit picturesand other forms of graphic information from point to point or fromo
. The Bell System technical journal . Fig. 3—Telephotograph receiving machine. A-B-C-D- -Optical 554 BELL SYSTEM TECHNICAL JOURNAL. A NEW TELEPHOTOGRAPH SYSTEM 555 two bays of relay-rack-mounted apparatus, and a cabinet of powersupply equipment. A third bay comprising loop terminating arrange-ments, telephone, and loud speaker equipment may be furnished bythe telephone company if ordered by the customer. This telephoto-graph equipment connected by suitable circuits will transmit picturesand other forms of graphic information from point to point or fromone to a number of points simultaneously. Figure 4 is a schematic diagram illustrating the functional relation-ships of the various units of this equipment. Certain features ofthese units that may be of special interest have been selected fordescription in the following. Motor and?Associated Speed Control CircuitAlthough the driving motor for the telephotograph machine isessentially of the d-c. shunt type, it functions in combination with itsassociated speed control equipment as a synchronous unit and uponstarting locks automatically in synchronism with the frequency
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
