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distance. The  ring/reticule system for this adjustment on the right ocular seems to be partly stuck and to avoid damage  upon force, I first would like to  learn some details on the construction. Is  anyone familiar how the rotate-able ring is attached to the  reticule? I can turn the ring in  both directions over 180 degrees but the reticule seems to be stuck as it does  not follow the movement. Also, both eye cups are missing. May be someone  has eye cups from a similar model beyond  repair? The bino has large diameter oculars, the diameter size of the fine thread which takes the eyecups is about 31.5  mm. Overall, the rest of the bino is in good  shape and certainly a nice piece in the collection. Any help from someone who has seen these binoculars  before?  Guus

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Subject: Russian 10-30 x 80

From: "jean" <jean-laurent.pernice@___o.fr>

I send you some pictures of unusual russian big bino found last summer.  This one is described in the catalog of the Coblenz military museum.  It is a 10 to 30x 80 optic; not very nice but very clear and bright (the same quality than the 20x110 russian binoculars ) The interesting thing is the magnification which can be change progressively from 10 to 30 like a real zoom camera.  The eyes pieces seem to be the same than thoses seen on the 15x110 russian binoculars.  It would be very interesting to know the mechanism of this type of magnification variation , and to have informations concerning the manufacturer and for which use this optic has been built.  If someone in your list can help me?  

Regards from south of France,  Jean-laurent

PS  I will try to come in Coblezn next september.

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Binocular List #286: 16 Feb. 2004

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Subject: Catalogs on line

The Smithsonian continues to post scans of their instrument catalogs.  You can download individual pages.

Negretti & Zambra's huge catalog of instruments from the 1870's:

http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/51789/

Negretti & Zambra.  Negretti & Zambra's Encyclopaedic Illustrated and Descriptive Catalogue / of Optical, Mathematical, Philosophical, Photographic and Standard Meteorological Instruments.  London: ca. 1878.  564 p.

Opera, race, & field glasses p267-273.

p274-289; 274-275 invention of the telescope; 279-280 binocular telescopes.

p272 quartz objectives:  'Rock crystal for tropical climates...retains its polish'....12 lenses.

This last description is quite interesting.......I wonder if fungus does not grow on quartz?

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C.P. Goerz.  Triëder-Binocles.  Berlin: 1906.  32 p.

http://web4.si.edu/sil/scientific-instruments/SIsingle-record.cfm?AuthorizedCompany=C%2EP%2E%20Goerz

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Subject: Zeiss loupe

From: " Jack Kelly" <jkelly@___mentsales.com>

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