Construction of telephone system, placing cross-arms and insulators on telephone pole
Mammoth Cave National Park; National Park Service
Telephone line construction, view in automatic switchboard house, scene shows telephone lines being tested, 1939
Mammoth Cave National Park; National Park Service
Showing men constructing new telephone line near the central office, 1939
Mammoth Cave National Park; National Park Service
Wheel for radio generator, Round Bottom Camp, NP-19
Great Smoky Mountains National Park
Wheel for radio generator, Round Bottom Camp, NP-19.Radio Generator, II-U-Gen-11995, Physical Facilities - Utilities - Miscellaneous utilities (incinerator; power line and systems; garbage can washing facilities; telephone line; radio)
Wheel for radio generator, Round Bottom Camp, NP-19
Great Smoky Mountains National Park
Wheel for radio generator, Round Bottom Camp, NP-19.Radio Generator, II-U-Gen-11996, Physical Facilities - Utilities - Miscellaneous utilities (incinerator; power line and systems; garbage can washing facilities; telephone line; radio)
Table Rock SP5 Telephone Line to District Fire Wardens house
South Carolina Department of Parks, Recreation and Tourism
Scale: 1" = 300'
Forestry, cutting dead trees from near new telephone line to prevent them from falling on and damaging the line, 1938
Mammoth Cave National Park; National Park Service
Forestry, cutting dead trees from near new telephone line to prevent them from falling on and damaging the line, 1938
Mammoth Cave National Park; National Park Service
Clearing area for new telephone line and cuttingdangerous timber from near line, 1938
Mammoth Cave National Park; National Park Service
Cleared area for new telephone line to be usedby the park service, 1938
Mammoth Cave National Park; National Park Service
Forestry, pruning trees along telephone line, cleared area on Highway 70, 1938
Mammoth Cave National Park; National Park Service
Forestry, pruning trees along telephone line, cleared area on Highway 70, 1938
Mammoth Cave National Park; National Park Service
Raising pole on new telephone line, 1938
Mammoth Cave National Park; National Park Service
Raising pole on new telephone line, 1938
Mammoth Cave National Park; National Park Service
Placing crossarms on telephone poles
Mammoth Cave National Park; National Park Service
Placing crossarms on telephone poles
Mammoth Cave National Park; National Park Service
Forestry, showing type of cutting employed in clearing for telephone line construction, NP-2
Mammoth Cave National Park; National Park Service
Forestry, pulling out jump cut that falling branch may tear, telephone lines fastened to tree being pruned, tree at Mammoth Cave Ferry picnic area, 1938
Mammoth Cave National Park; National Park Service
Enrollee drilling into new telephone pole while another enrollee removes bark from pole
Mammoth Cave National Park; National Park Service
Showing men carrying reel of wire for the telephone line which is being constructed in the park area, 1939
Mammoth Cave National Park; National Park Service
Construction, showing how wire is stretched from post to post, telephone lines, 1939
Mammoth Cave National Park; National Park Service
Telephone line construction, digging ditch near technicians' building for underground telephone line, 1939
Mammoth Cave National Park; National Park Service
Telephone line construction, laying cable for underground lines of new telephone system, 1939
Mammoth Cave National Park; National Park Service
Telephone line construction, switchboard house for new telephone system, 1939
Mammoth Cave National Park; National Park Service
Telephone line construction, splicing underground cable at automatic switchboard house for new telephone system, 1939
Mammoth Cave National Park; National Park Service
Telephone line construction, riding messenger cable and attaching rings to carry aerial telephone cable on new telephone system line, 1939
Mammoth Cave National Park; National Park Service
Telephone line construction, using truck to stretch aerial cable on new telephone system line, 1939
Mammoth Cave National Park; National Park Service
Telephone line demolition, taking up poles on which telephone wire was strung before underground wire was installed, 1939
Mammoth Cave National Park; National Park Service
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