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UNIVERSAL  LIGHT / EXPOSURE   METER
WESTON  MASTER  III


Instrument shown with Scale-2


Back side with partly OPEN FILTER



» EXPOSURE GUIDE «  from  Hedgecoe's  book,  p.134

LIGHT/EXPOSURE METER    WESTON ELEC.INST.CORP., Newark, NJ / USA  (1960)
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Model = 737    SN = 1233177    Scale-1 = 0 .. 50 ;   Scale-2 = 0 .. 1600

The nice die-cast aluminum instrument was for professional photographers
and came in a double-sided leather carrier.  It is a SELENIUM CELL LIGHT
METER which needs  NO BATTERY.  When exposed to light the cell generates
an electrical current  directly proportional to the amount of light upon
it.  This in turn,  activates a needle, which moves across a  CALIBRATED
SCALE (based on "Candles per Square-Foot"),  indicating various settings
of shutter speed & aperture.  In BRIGHT LIGHT a FILTER-FLAP has to cover
the cell on the back side, reading the SCALE-2 on front. -  In LOW LIGHT
conditions this flap has to be opened, this changes to SCALE-1 on front.

impressum:
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© C.HAMANN      http://public.beuth-hochschule.de/~hamann       01/07/12