[Aktungbby]

Originally Posted by Sailor Steve

This is great!

Just to back up what Hitman said, both British and American reports on the captured U-570 show that 1.5x and 6x are the correct magnifications for both periscopes.
http://www.uboatarchive.net/U-570.htm

American periscopes were also set up the same way.
http://www.maritime.org/doc/fleetsub/pscope/index.htm

I'm looking forward to trying this out.

INDEED! The critical page from the American Assessment:

"The periscope was operated by the observers. It operated smoothly and noiselessly by hydraulic power and manual control. Fine control of training speed is possible under both power or manual operation. The following other features are incorporated in the instrument:

(1) Two powers 1.5 and 6.0 Corresponding fields are 380 and 90.

(2) Prism tilting between angles of minus 15 to plus 20 degrees.

(3) Direct reading range scale.

(4) Ray filters.

(5) A well illuminated azimuth of large diameter (approximately the diameter of the rotating housing) with vernier and bearing marker.

(6) Means for electrically transmitting periscope bearing to the torpedo data computer.

Periscope drying connections show in Photograph No. 7 labeled"Saugen".

The outboard support for the periscope tube is shown in Photograph No. 7.

There was no evidence of hull stuffing box leakage at either of the periscopes.

All officers with whom this periscope were discussed agreed that it is the best built and most satisfactory periscope from a military point of view that they had ever seen, and they considered that the concessions in space and weight to accommodate it were fully justified. It is recommended that full constructional details of this instrument be obtained from the Admiralty, and that the manufacture of a U.S. prototype to this design be put in hand at the earliest possible date." The "attack" periscope was definitely the most impressive installation in the ship. It has elicited the greatest admiration from both British submarine officers and the observers. It is described by experienced submarine commanders as "the answer to an attack officer's prayer". This "fixed-height-of-eye" periscope is beautifully engineered. "The "attack" periscope was definitely the most impressive installation in the ship. It has elicited the greatest admiration from both British submarine officers and the observers. It is described by experienced submarine commanders as "the answer to an attack officer's prayer". This "fixed-height-of-eye" periscope is beautifully engineered...." The captain's seat, foot controls with height-of-eye ergonomics really knocked 'em dead!