. The microscope and its revelations. matter is simple. As the microsc >pe has to be turned into awide-angled polarising telescope, all that is necessary is to screw a lo\\power on the end of the draw-tul „-. as in 1ig. 2(5.). As the light requiresto be passed through the crystal at a considerable angle, a wideangled condenser should be employed, but it need not be achromatic. 120 ACCESSORY APPARATUS The objective most Miitablc is a 14,[ths of -(55 ; but a j-th of or a J-nl of •()•) will do equally well, as the whole of theliark lens of tlie olijective should be visible th
. The microscope and its revelations. matter is simple. As the microsc >pe has to be turned into awide-angled polarising telescope, all that is necessary is to screw a lo\\power on the end of the draw-tul „-. as in 1ig. 2(5.). As the light requiresto be passed through the crystal at a considerable angle, a wideangled condenser should be employed, but it need not be achromatic. 120 ACCESSORY APPARATUS The objective most Miitablc is a 14,[ths of -(55 ; but a j-th of or a J-nl of •()•) will do equally well, as the whole of theliark lens of tlie olijective should be visible through the analysing• Nicol ; the back lens of the objective must not be too large, thus a., inch of-li.) would not do so well. The analysing prism maylie placed cither where it is in the drawing- or above the ically it works very well above theobjective, which is the position, it occupiesin ordinarv microscopical outfits. For the draw-tube a 2-inch objectiveand a 1> or C eye-piece will
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
