. The book of photography; practical, theoretical and applied. Fig. 679.—Photomiceographig Apparatus for On. Lamp. mination. Hinks patent duplex burnersare also eminently suited for the projection lantern with a triple wickand a condenser parallelising the raysin combination with a convex condenser Incandescent Gaslight. For use in ][)hotomicrography an incan-descent gas burner may be supported ona stand at the proper height so that the. Fig. t3>.^.-, iuuiuAULi;uGi;AiHiC Api-ahai ls. 3 in. diameter and 10 in. focus will befound to yield a very intense flame of an
. The book of photography; practical, theoretical and applied. Fig. 679.—Photomiceographig Apparatus for On. Lamp. mination. Hinks patent duplex burnersare also eminently suited for the projection lantern with a triple wickand a condenser parallelising the raysin combination with a convex condenser Incandescent Gaslight. For use in ][)hotomicrography an incan-descent gas burner may be supported ona stand at the proper height so that the. Fig. t3>.^.-, iuuiuAULi;uGi;AiHiC Api-ahai ls. 3 in. diameter and 10 in. focus will befound to yield a very intense flame of an oil lamp is much yellowerthan the illuminants already considered,and therefore its actinic value is not-in propoition to its intensity; in conse-quence the exposures required are a littlelonger than would be the case with awhiter light of the same intensity. Withan ordinary oil lamp, a bulls-eye con- brightest part of the mantle may be usedfor illuminating purposes; or the burnermay be mounted on an arm which can bemade to slide on a metal rod and clampedin the proper position. If the old formof burner is used the chimney shoidd beof mica, and the mantle should be sup-ported upon a platinum wire stretchingacross the chimney at the proper height;the usual clay supporting rod cannot be 518 THE BOOK OF PHOTOGRAPHY. used because it produces a dark shadowin the centre of the field of view. In thenewer Kern burners the support
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
