. The book of photography; practical, theoretical and applied. for focussing, and all other inscriptionsusually found on a lens, are engraved uponthe mount by the machine shown in , of which mention has alreadj^ beenmade. This machine is, in principle, a de-velopment of the well-known copy of the inscription to be engravedis used, several times larger than required,and the operator, by moving a style alongthe lines of this copy, works a gravingtool about the lines to be engraved. The l-ig. 548.—Method of Staktixg PatentScrew. ? is applied with a brush, the workhaving previo
. The book of photography; practical, theoretical and applied. for focussing, and all other inscriptionsusually found on a lens, are engraved uponthe mount by the machine shown in , of which mention has alreadj^ beenmade. This machine is, in principle, a de-velopment of the well-known copy of the inscription to be engravedis used, several times larger than required,and the operator, by moving a style alongthe lines of this copy, works a gravingtool about the lines to be engraved. The l-ig. 548.—Method of Staktixg PatentScrew. ? is applied with a brush, the workhaving previously been heatedsufficiently to evaporate the alco-hol as the lacquer is shellac is thus distributedevenly over the surface, and be-comes hard as the metal will be seen that mountsshould not afterwards be un-necessarily warmed, or the lac-quer may thus be softened anddamaged; nor should they bewashed witli alcohol, as is some-times advised, for that removesthe
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
