e if some such method as that suggested by M. Ferrand between the focii, so much larger is the projected pic- workmen engaged in the craft. M. Etienne Ferrand, ture, the conditions being otherwise the same. For were applied, good leather could be made without any of Lyons, has recently brought… … BACKGROUND. jected pictures are about twenty-five times as large as though equally strong, would not be so heavy, and the remedying this evil. After the leather has been tanned, those projected by an ordinary lens, the distance of the but prior to its being rendered supple and before it is workmen…
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