Central Pacific Railroad Photographic History Museum

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F.W. Gregory Patent Insulator, c. 1903.

CD 159 embosssed PAT APRIL 7TH 1903, F.W. GREGORY.
These insulators were used along the railroad right-of-way of the Central Pacific in the Sierra Nevada Mountains of California.

Courtesy Ross Baird.

Also see:

• Gregory Insulator Patent Courtesy of Bill Meier.
• CPRR Telegraph Key and Sounder
• CPRR Telegraph Key Courtesy Smithsonian Institution.
• CPRR Brooks August 6, 1867 Transcontinental Telegraph Insulator
• UPRR Glass Threadless Transcontinental Telegraph Insulator, CD735 Mulford & Biddle, c. 1867
• Telegraph Pole, old growth redwood, CPRR original construction, 1864