0 superficial feet. The of producing was shown by the aid of an instrument called employed as in photographing at the same time objects ly- lap of slates varies from 2 to 4 inches. The pitch of a slate the megascope, represented in Fig. 13. This is nothing more ing in several different planes more… … and Engineers. tained ; but the absolute alkali power and value as repre- ‘‘depth of focus.” This is necessary even in taking a por- [We are constantly receiving letters, asking for simple sented are best shown in the amount of crude or commer- trait, where the nose and the ears of the sitter, for…
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