Metal type has been replaced by photocomposition . 金属活字为照相排版所代替。
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Photography - paper dimensions - rolls for photocomposition 照相排版用卷筒相纸尺寸
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Photography - film dimensions - rolls for photocomposition 照相排版用卷筒胶片尺寸
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In photocomposition , a backspacing technique whereby one character is tucked into another in order to avoid the optical impression of excessive spacing that can arise from the varying shapes of characters and combinations of characters 照相排版中的一种退格技术，借此可以把一个字符挤入另一个字符所占的空间里，从而避免因字符的形状不同和不同的字符组合而引起的间隙过大所产生的不理想的视觉印象。
