Improved Oakman insulator design.

[Trade Journal]

Publication: Western Electrician

Chicago, IL, United States
vol. 7, no. 10, p. 127, col. 3



The cut shows a form of insulator designed as an improvement over the ordinary glass petticoat form. The illustration explains itself. The interior surface has upon it annular projections forming grooves. The upper sides of these grooves are inclined, but their under sides




are nearly or quite horizontal. By this construction not only is the surface distance from the pin to the conducting wire increased, but the interior of the "petticoat" is much better protected from moisture by means of the ridges. These ridges protect the grooves, and thus keep at least a part of the surface dry, a consideration of great importance in insulation.

This insulator has recently been patented by Samuel Oakman of Melrose, Mass.


Keywords:Samuel Oakman
Researcher notes: 
Supplemental information: Patent: 434,879
Researcher:Bob Stahr
Date completed:August 6, 2008 by: Elton Gish;