Instructions For Imperial Exposure Meter
Imperial exposure meter - No 1 for bright light instructions. Imperial Dry plate Company
Book type actinometer, with a sliding strip of sensitive paper, slide rule calculator with scales for actinometer times 1/5-100, H & D speeds 5-600, apertures f/4.5-64 US 1-256, and exposure times 1/500-60 secs.Imperial Dry plate Company
Imperial exposure meter - No 1 for bright light instructions. Imperial Dry plate Company
Sensitive paper pack. Imperial Dry plate Company