. Elementary chemical microscopy . Fig. 93. Microscope Lamp; E. Leitz. Arc Type. Automatic. tained from good carbons. These should be moderately soft and of uniform composition. In most cases the interposition of a cell filled with water between the arc lamp and preparation is essential in order to prevent damage to optical apparatus and specimens by heat. Filling the cell with a solution of alum or ferrous sulphate is no better than pure water alone. Next to the carbon arc, the Nernst lamp is most satisfactory, so far as light intensity and con- venience of mounting are con- cerned. Fig. 94 s
. Elementary chemical microscopy . Fig. 93. Microscope Lamp; E. Leitz. Arc Type. Automatic. tained from good carbons. These should be moderately soft and of uniform composition. In most cases the interposition of a cell filled with water between the arc lamp and preparation is essential in order to prevent damage to optical apparatus and specimens by heat. Filling the cell with a solution of alum or ferrous sulphate is no better than pure water alone. Next to the carbon arc, the Nernst lamp is most satisfactory, so far as light intensity and con- venience of mounting are con- cerned. Fig. 94 shows a Nernst glower galvanometer lamp * which serves admirably for microscopic work, especially for 1 Made by the Cambridge Scientific Instrument Co., Cambridge, England.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmicroscopy, bookyear1
