US ARMY AIR FORCE AGFA-ANSCO COLLIMATOR 1944 WWII
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This is from an Optical Glass Machine Shop. Our knowledge is limited to what is shown in this listing. We were told from the owner that this is in working condition but we have not personally tested it and the pricing should reflect that.
A collimator is a device which narrows a beam of particles or waves. To narrow can mean either to cause the directions of motion to become more aligned in a specific direction (i.e., make collimated light or parallel rays), or to cause the spatial cross section of the beam to become smaller (beam limiting device).