Hi
Can anyone provide any info on Berthiots Eurygraphe series IV, I'am aware of the scant few lines in the Vademecum. I have an advert for the "trousse eurygraphe" in french which I will scan and post later. The advert came with my Trousse eurygraphe
No2 serie IV c which contains 390,305,230 cells with the barrel and iris marked in millimeters, cominations 390+305 = 173, 390+230 =155, 305+230 =138.
The vademecum states Q9/dagor type and maybe an etxra reflection, I see two bright and one dim plus another tiny one and this seem correct. They seem to have been made for some time with the Trousse set from the late 20's serial number 170863 and I just recieved a eurygraphe IV a serial number 400275 but I can't find the serial list again to date this.
so questions 1. Any idea of coverage the 173 combo just covers 10x8 the others clip
which is fine as the set is for 5x7 .
2. could they be collinear design the cells on the 180 IV a aren't symmetrical pair I maybe wrong but dagors are symmetrical and not convertable, the front cell is much thicker than the rear and focal lenghts are different.
I'd like to make some tests and more importantly use them, but I'm moving in the near future so that will have to wait.
Thanks and Regards
Sven
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