gene_nieminen

http://www.smallbattery.company.org.uk/index.htm?http://www.smallbattery.company.org.uk/sbc_px625.htm

 

the zinc air battery may work!

http://www.acecam.com/magazine/battery1.html

The mercury battery is no longer made by anyone � as far as I have been able to tell. Heard that a German company made em .. No luck. The voltage is different with the alkaline batteries; the meter would have to be calibrated with the new batteries to have any accuracy. A job for an expert? Maybe some can instruct the procedure?

I took this approach.

I opened a can of film �Valsts Elektrotechniska Fabrika Riga-Latvia� with the date �SEP 1942� �Filmas VEF Minox Riga� the yellow tin can. �2 FILMAS 100 EXP�, 10 DIN. Took the original cassette wrapped in black paper out and pulled out a length of film to make a loop and placed a heavy white weight into the loop to hold the film flat on the glass of my high quality flat bed scanner. Scanned a four inch section of the film emulsion to the glass.

 

Tried several scans at different places and alignments to the direction of the scanner, at several different dpi�s 400 dpi 1000 dpi and 2,000 dpi and at several percents 100 %, 400 percent, 800 %. All this to confirm my test results.

 

In PhotoShop I determined the drop off of the edge of the film at several places on the section of the scan pixel by pixel white edge to white edge. PhotoShop gave me the size of the image in mm.

 

The film sized up at an average of 9.35 mm.

 

9.33 mm to 9.37 mm were the ranges of my test roll most being 9.35 mm � this is only a pixel by pixel different .

 

With an expiration date of 1942 this roll was produced ( 1939-1940 ???) �How many years prior to the date? In the mid-point of Minox production.

 

The film may have (aged) changed in size over the years, this is where it is now. 9.35mm.

 

I have some rolls from post war 1947 dated round tins and paper boxes. I�ll test some of those too - - these may show the German influence.

Gene<div></div>