气球驾驶员约翰·斯坦纳在宾夕法尼亚州伊利为自己的热气球充气。 图为最古老的飞行器照片，摄于1857年，采用的是四分之一感光底片旧式照相法。
Aeronaut John Steiner inflates his hot air balloon at Erie, Pennsylvania, as seen in the oldest known photograph of an aircraft, a quarter-plate ambrotype taken in June 1857.
采用天然气热氯化法生产二氯甲烷以供感光材料工业作溶剂。
Use of natural gas for heat chlorination methylene chloride for the production of photographic materials for industrial solvent.
是一种天然蛋白质，可溶于水，在蛋白中最为常见。这种胶质在照相制版法里用以作重铬酸盐感光剂。
Natural protein, soluble in water and most commonly found in the Albumins, the colloid used for certain dichromated sensitizes employed in photomechanical process.
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