Bell telephone magazine (1922) (14569475570)

Identifier: belltvol20elephonemag00amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive



Text Appearing Before Image:
eBell System through the Crisfield tele-phone exchange. The radio linkequipment consists of radio trans-mitters and receivers operating at frequencies around 160,000 kilocycles—the highest frequency in Bell Sys-tem commercial radio telephony to-day. The channel is controlled fromthe Crisfield telephone office, and pro-vides a circuit between Crisfield andSmith Island, Crisfield and TangierIsland, and between the two islandsthrough Crisfield. In effect, a forkedradio channel has been devised, engi-neered to cut the tine to one islandwhen operating with the other. The mainland radio station is in amarsh near Jenkins Creek, just out-side the village of Crisfield. Herethe equipment is all housed in poleboxes. The radio receiver is on onepole, which is likewise the support forthe beam antenna used for receiving.The balance of the radio equipment—largely radio transmitter, controlunits, and beam transmitting antenna—is supported by another pole about 134 Bell Telephone Magazine AUGUST
Text Appearing After Image:
An Island Telephone Installation The switch at the right of the instrument on the wall gives access either to the radio telephone circuit to Crisfield or to the local wire circuit for conversation among the islanders 30 feet away from the first. Betweenthis latter pole and a stub pole about5 feet distant is a platform which sup-ports an emergency power supplygenerator which will start automati-cally if there should be an interruptionof the regular power. On the islands other sixty-foot an-tenna poles, towering over the flatmarshlands, disclose from afar thelocation of the sending and receivingapparatus and wholly automatic gaso-line engines which generate the neces-sary power; all snugly fitted into di-minutive huts which gleam white innew paint. To give the inhabitants on the is- lands convenient access to the service,four telephones have been provided oneach island, strategically placed invillage store or dwelling. A flip of akey switches these instruments off theradio connection an