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Thread: Hermagis Serial numbers Need your help with a database

  1. #51

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    Re: Hermagis Serial numbers Need your help with a database

    Added to the list!

    This size no.4 is popular! Both Rudi and I have it.

    I have just realised that most french makers seem to have started using serial numbers during the middle and late 1850's. Will research a bit and find out if it is worth a separate thread, especialy as to who started the trend.

  2. #52

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    Re: Hermagis Serial numbers Need your help with a database

    Quote Originally Posted by purplecloud View Post
    here is mine
    SN 9335 convertible petzval
    height 215 mm
    front lens diameter 80 mm
    Do you know what's written in pencil on the edge of the lenses ?

    Just curious, part of the fun finding out ;-)

    Cheers !

  3. #53

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    Re: Hermagis Serial numbers Need your help with a database

    Received a #4 Hermagis Convertible 9787 today.

    Front Achromat reads "Hermagis" and in similar cursive writing "B.L.N". In addition in what I believe to be a different style writing "E. Vallet"

    Rear negative meniscus reads "Hermagis" and in similar cursive writing "B.L.N". We find the same "E. Vallet" writing. Almost illegible, in small cursive also E. Donche. Some rim glass damage to this element. Rear group had the elements flipped and the positive lens reversed. Corrected upon assembly.

    No WHS but there was a thick black cardboard washer style restrictor installed marked in pencil with F=7 in a cavity made for the purpose. Need to remove the rear lens group to access.

    No dates, no slew of numerals but possibly the initials of the workers and equally possible names of others who have worked on this lens. Achromat is flawless, no separation, so most likely well maintained during life.

    EDIT

    What I'm describing above as a washer style restrictor was of course used for aperture control on the landscape lens. This #4 has a lip to prevent the stop to fall through. My #3 convertible (1859) doesn't have this feature at the landscape side of the lens.

    Cheers,
    Last edited by Amedeus; 10-Jan-2018 at 21:06. Reason: added restrictor info.

  4. #54

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    Re: Hermagis Serial numbers Need your help with a database

    Hermagis Petzval (non-convertible) serial #15981 from 1874, focal length 215mm, WHS.

  5. #55

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    Re: Hermagis Serial numbers Need your help with a database

    Added to the list. There are quite a few years in the 1870's after this one (1874), where we still have holes and, perhaps, low annual productions. Could this be due to Dallmeyer's Patent Petzval becoming popular?

  6. #56

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    Re: Hermagis Serial numbers Need your help with a database

    Hermagis convertible, #7 size, serial number 9277j, no WHS

    No markings on front achromat (was re-balsamed at least once in its lifetime)

    Rear cell negative lens marked Hermagis, no other marks found. This lens had every single thread mis-treaded.

    The restricter has provisions for removable stops.

    This #7 design is slightly different than my other #7 design (serial 12561 with WHS)
    Last edited by Amedeus; 17-Jan-2018 at 13:35. Reason: WHS comment

  7. #57

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    Re: Hermagis Serial numbers Need your help with a database

    I was stimulated to have a look at my no. 8 plain petzval again. This is one of my two pre-serial number lenses (and before the introduction of the convertible patent lens). Full of edge numbers - I think I have mentioned this before. I did some comparisons with the table of lens diameters and size reproduced in the P et P Hermagis booklet. This gives the diameters in both the original (archaic) measures as well as modern metric measure. This table cannot be very precise, as there is no constant factor for ligne/mm. This number 8 is listed as 19 lignes and "translated" to 44mm - whilst the real diameter is 41/42mm on my no. 8. I don't think this is an "early variant" size as Hermagis (And other makers) stuck to the lens diameters they had selected early in their history. Hermagis, used lens diameters 54, 61 and 81mm for all series until their anastigmatics.

    Table of 19th century serial numbers is updated.

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