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Mr. O. G. Simmons-----3

from a steel casting. Of course, steel is not as good a metal for either cylinder or piston as the ordinary gray cast iron, but it enables one to build in very much lighter weights. While the light weight of the moving parts adds a good deal to the life of a motor and to the speed at which it can be run, yet if the light piston should warp too much it would cause friction that might over-come all the advantages to be derived from its light weight. The gray cast iron pistons used in the Wright motors built in France are considerably lighter than those we are using in our American motors, but the lack of power in our French motors, I think is due to other causes.

I will be glad to hear at all times how you are getting along.

Very truly yours,
[[signed]] Orville Wright [[/signed]]