Glass Insulators Keep Insects from Refrigerator - July 1919

By Bill Meier; posted May 4, 2022

View Original (3269 x 3068) 1615KB


From Popular Mechanics Magazine - July 1919

Note the description. They are used just like battery rests where they fill the area between the skirt and the pin with liquid.

[id: 651680300; Original] found by Eric Halkyard; this is a larger example.