Name/Title
H.G. Co. insulator, 1893Entry/Object ID
2024.42.1Description
Acc. No. 42.24.1
Subject Category: Bureau of Electricity, Alameda Power
Date or Period: 1893-1997
Object: insulator
Description: a dome-shaped turquoise colored glass insulator. It is smooth on the outside but has ribs or a screw-thread on the inside, and notches along the flared bottom edge - some are broken. Embossed on one side is: 'H.G. Co. / PATENT MAY 2, 1893', and on the other side, 'PETTICOAT'.
Size: H. 3 1/2", diam. 3"
History of Object: Object was salvaged by the donor in June 1997 from a pole in front of 1918 Lafayette Street.
Acquired from: Ross Dileo; Donation Date unknown
Catalog Date: 5/6/2024Interpretative Labels
Label
INSULATOR
Made by H.G. Co.
Insulators were made of pottery or glass, materials that do not conduct electricity. They were placed on top of telephone, telegraph and electricity poles as a barrier between the cables or wires and the wood of the poles.
The oldest midels are smooth inside, later models have a screw thread inside.
They were made by many different manufacturers and in many different colors; glass manufacturers would simply pour leftover glass from other projects into the insulator molds.
