Radio Loudspeaker LS-3, Signal Corps US Army S2 Tracker See the diagram of the

See the diagram of the system with an explation of its function in the photo gallery

At about 170 pages

and shutter speed is adjustable from 125 to 500

and this manual is labeled for use in TC-47D serial # 44-76314 (presume assembled/shipped in 1944

Radio Loudspeaker LS-3, Signal Corps US Army S2 Tracker See the diagram of theThe LS 3 Loudspeaker was used during WWII with a variety of US Army Signal Corps receivers, such as the BC 312 and BC 348, and used on into the 1950's. Would have been used in ground installations (as opposed to use within aircraft, where headphones would likely have been the preferred method of rendering audio to the crew). See the photo of the interior. It appears that the components may be original and untouched. We have not tested it, so selling