Testing a rotary converter in the early 1900s.
Previously:
1938 lightbulb brightness testing machine - photo
Little Boy testing equipment - photo
Vacuum tube tester - photo
36kV hi-pot electrical tester - photo
Testing a rotary converter in the early 1900s.
Previously:
1938 lightbulb brightness testing machine - photo
Little Boy testing equipment - photo
Vacuum tube tester - photo
36kV hi-pot electrical tester - photo
New plans added on 11/22: Click here for 2,593 plans for homemade tools.
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