Original U.S. WWI Army Signal Corps Binoculars by Bausch & Lomb with Compass Equipped Leather Case Royal Air Force Standing 10" tall constructed of

Standing 10" tall constructed of of solid cast brass with a turned wood handle the rim of the bell is 5" across and is clearly stamped:

By  exerting the full power of research of the Army

The following excerpt is from the book Military Pyrotechnics: The History and Development of Military Pyrotechnics

German wartime era helmets did not receive any shell stamping marks other than those described here

Original U.S. WWI Army Signal Corps Binoculars by Bausch & Lomb with Compass Equipped Leather Case Royal Air Force Standing 10" tall constructed ofOriginal Items: One Set only. This is a very nice original pair of 6 POWER Binoculars for the U. S. ARMY SIGNAL CORPS, well marked complete with neck strap and detailed markings on the rear of the barrels. The binoculars are fully functional, with both diopters turning smoothly, and optics intact, though a bit dusty. There is also a wonderful ranging reticule in the left eyepiece. They are marked with details on left side of eye piece: PRISM STEREO