William Sanford, Switchman, In The Michigan Bell Telephone Exchange Building, March 1958
Year:
1958
Copyright
Copyright Protected
William G. Sanford, Michigan Bell Telephone Switchman, With Sound Machine, March 1958 Photographer: Doug Fulton
Year:
1958
Published In:
Ann Arbor News, March 20, 1958
Caption:
RINGING MACHINE: The machine that switchman William G. Sanford is observing provides the dial tone, ringing and busy signals at individual telephones. The mechanism is alternately used with others like it to assure no interruption in the "beaming" of the three sounds.
Ann Arbor News, March 20, 1958
Caption:
RINGING MACHINE: The machine that switchman William G. Sanford is observing provides the dial tone, ringing and busy signals at individual telephones. The mechanism is alternately used with others like it to assure no interruption in the "beaming" of the three sounds.
Copyright
Copyright Protected
William Sanford Tends Batteries In The Michigan Bell Telephone Exchange Building, March 1958
Year:
1958
Published In:
Ann Arbor News, March 20, 1958
Caption:
POWER SOURCE: Bell switchman William G. Sanford of Ann Arbor fills with water one of a bank of 48-volt batteries that furnish power to phones in users' homes and elsewhere. Other banks of batteries are in background. In the event that power is cut off to generators that charge the batteries, a 170-kilowatt diesel-generator may be "cut-in."
Ann Arbor News, March 20, 1958
Caption:
POWER SOURCE: Bell switchman William G. Sanford of Ann Arbor fills with water one of a bank of 48-volt batteries that furnish power to phones in users' homes and elsewhere. Other banks of batteries are in background. In the event that power is cut off to generators that charge the batteries, a 170-kilowatt diesel-generator may be "cut-in."
Copyright
Copyright Protected
Behind The Scenes At The Telephone Company
Parent Issue
Day
20
Month
March
Year
1958
Copyright
Copyright Protected
- Read more about Behind The Scenes At The Telephone Company
- Log in or register to post comments