I found these glass telegraph insulators near the site of Strontia Springs, Colorado in 1978.
Left to Right
(3) Hemingray
(1) Hemingray No. 16
(1) Hemingray No. 40
(1) H. G. Co. J Petticoat
Below
(1) Short pedestal, wood cap, and nut
(1) Long pedestal, wood cap, and nut
The telegraph poles in Waterton Canyon were sawed off probably in connection with the scrapping of the C&S railroad’s South Park Line between 1938 and 1941. A couple of the poles fell in groves of scrub oak and were buried by decades of autumn leaves, with insulators, caps, pedestals, and cross beams still intact in 1978. The telegraph lines were gone, but wire still wrapped some insulators. A nail was used with each nut to keep it from working loose over time.