Oil Engine 20 x 30 Poster

20inch x 30inch Poster The oil engine has been developed rapidly during the last few years. Its fuel is petroleum vapor, introduced in definited volume into a highly heated chamber, together with a suitable supply of air, and exploded. The explosion gives the power to the working stroke. The type of oil engine shown is remarkable for the very high compression and temperature employed. - There is a border around the image. Image size is correct.