By 1910 this manufacturer offered two radial rotary engines with 7 cylinders.

-The 30-35 HP and the 70-80 HP, weighing 3 lbs per HP. This was a high index since in the war and post war it was 1 Kg/HP and later below the Kilo.

“Holmes engine hold by a laborer”

-Below we show a 1910 ad, date of the engine offer.

“Holmes Rotary Motor ad”