Electro-Vac worked but they were expensive.
A few years later cars and trucks had electric wipers.
Sales of Electro-Vac dropped off.
Attachments
EV 01.jpg (137.23 KB, 152 downloads)
EV 02.jpg (47.91 KB, 152 downloads)
EV 03.jpg (61.92 KB, 152 downloads)
EV 04.jpg (56.28 KB, 152 downloads)
EV 05.jpg (88.28 KB, 151 downloads)


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."