Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 42
s-eye is used on a separate stand there is anothermethod of using it which is useful for even high powers. If the bulls-eye condenser is placed with its flat surface upwards, nearly parallel with the direc- ^^..^. tion of the light, as in Fig. 29, • ^■■^^^ *^® ^S^* enters the curved y^^ surface and… … Fig. 28.—No. 3332.
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