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116pp.  $20.

Presumably this can be found via links at their forum page:

http://www.deutscheoptik.com/forums.php

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The Smithsonian has scanned & posted catalogs from scientific instrument manufacturers.

http://www.sil.si.edu/DigitalCollections/Trade-Literature/Scientific-instruments/explore.htm

So far, the only binocular papers are:

The Warner & Swasey Prism Binocular.  Circular 110, 1904.  4pp.

The Warner & Swasey Prism Binocular, n.d., 29pp.

The Warner & Swasey Prism Field Glass, n.d., 32 pp.

However, the last two are essentially identical.

--Peter

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Binocular List #270: 24 Sept. 2003

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Subject: 7X Marineglas

From: "Jack Kelly" <binocs@___m>

  Rich's photos of the 7X Marineglas raise some interesting questions.  First, in all my Zeiss production records and catalogs there is no mention anywhere of a 7x30 binocular.  Second, the size of the ocular eye lens is much larger than anything found before about serial number 1,000,000 (1919) when the first wide angle Zeiss binoculars (Deltrentis and Delturis) were introduced.  Third, Rich's 7x30 ( no. 523095) is very close in number to a Marineglas in my collection (553088).  The logos certainly look authentic.  The locking nut on the front is the same; the number stamped into the bottom prism cover (79604) is in the same place as one on my glass (104601) and; the objective trim rings on Rich's glass are of the later stamped design as they are on my glass.  The body design is also the later design with shorter objective tubes and longer body.

  As most everyone knows, the Marineglas and 6x30 Silvamar are essentially the same glass and appear to have gone through the same objective trim and body size evolution.  I also have in my collection a Swiss Army 6x30 dated 1912 (no.365315) and marked Armee-Modell, Vergr.=6.  It, too, is essentially identical to the Silvarmar and Marineglas of the era.  It is my opinion that, while there may be subtle differences between the various 6x30 glasses to meet the needs of marine service or specific military specifications, all the 6x30 binoculars produced by Zeiss in this time period were essentially identical.  Even the reduction in the diameter of the ocular eye lens that took place sometime after s/n 299111 occurred in the Silvarmar, Marineglas and the Swiss Armee-Model.

  This convoluted background now brings us to Rich's 7x30.  Was it made by Zeiss? Almost certainly.  Is it a production glass?  Almost certainly not.  Is it representative of the time consistent with its serial number (1914/1915)? Probably not.  My guess is that it is an experimental model used to evaluate the new wide angle eyepieces that were introduced in 1919.  This could have been done in the 1918-1919 time period using a glass removed from use or previously used by the engineering department for evaluation.  It's also possible that it was modified in the field at a later date (post 1919) and fitted with new eyepieces.  I think this less likely, however, since the 6x ocular must have been a very common service part.  Probably the best next step is to disassemble the ocular and identify its design.

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