Test A Silent Air Motor.

New York Times 100 years ago today, October 31, 1912:
Army Men Also Plan a Color Scheme to Make Airships Invisible.
    WASHINGTON, Oct. 30.— Successful experiments with a noiseless motor are being conducted by the Army Signal Corps at the aviation field at College Park, Md. The flight of an aeroplane is now almost noiseless. Lieut. Harry Graham is directing the tests of the new motive power, which promises to make the aeroplane a much more effective engine of destruction and more useful for scout duty in time of war.
    The army aviators also are preparing to experiment with a new color scheme for the machines which, it is expected, will make them practically invisible by day or night at a height of 250 feet.