I05. Evrard Ventilator
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The contact of the two wheels has the excellent characteristic that the tops of the teeth of the grooved wheel roll upon the root circle of the other wheel, without sliding. The grooved surfaces are of curtate epitrochoid section while the flanks of the extended teeth are cardioidal.

Reference :
Gelsone, Kathryn (Technician)
Peck, Susan (Technician)