Hi again, I'd like to share my idea of a modern WWI periscope, see my sketch attached to this mail. The mast itself will not be based on hoisting in and out of the pressure hull, but rather be a sort of pivoted jack-knife mast. This is made possible because the only component that will be rotating (azimuth) is the inner sleeve, denoted 'A' on the sketch. This sleeve (A) will be rotated by means of an offset stepper motor through a gear attached around the lower end of the said sleeve (A). Two large diameter bearings within the annulus between the sleeve (A) and the outer tubular mast, denoted 'B' on the sketch, will support and stabilize the sleeve (A) and its upper, rotating optics assembly, denoted 'D' on the sketch. The optics is only indicated by a simple mirror, although I plan to use proper prisms. The video camera, here denoted 'C' in the sketch, complete with remote operated focus and zoom, will remain in a fixed position at all times. As I said, it'll only be the sleeve (A) with its external optics that rotates around the stationary camera. The same sketch is also available through my ftp-server, ref ftp://ftp.artematrix.org/personal_submarine/optronic_mast/Rotating-Optics-WWI-Periscope.jpg Best regards, Jens Laland
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