1917 Holt Gas-Electric tank.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...k_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ctric_tank.jpg
More: https://en.wikipedia.org/wiki/Holt_gas_electric_tank
Previously:
https://www.homemadetools.net/forum/...1854#post75285
https://www.homemadetools.net/forum/...9694#post89851
https://www.homemadetools.net/forum/...989#post125173
https://www.homemadetools.net/forum/...839#post133520
https://www.homemadetools.net/forum/...173#post141612
https://www.homemadetools.net/forum/...397#post142549
https://www.homemadetools.net/forum/...439#post142707
