Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

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CH. X] DRAWING WITH HOUSE CURRENT 349 § 502. Concave mirror without a substage condenser. — For objectives of 20, 25, 30, 35, 40 and 50 mm. focus use the concave mirror without a substage condenser. § 503. Immersion objective. — For immersion objectives used in drawing do not forget to use the proper immersion liquid between the cover-glass and the objective ; cedar oil for the oil immersions, and distilled water for the water immersions. FIG. 195. SHIELD AT THE END OF THE ARC LAMP CONDENSER TUBE TO AID IN CENTERING THE LIGHT. This disc is of blackened sheet iron, asbestos or cardboard and is 125 to 150 mm. in diameter. It is placed at the end of the lamp condenser tube. If the light is centered, then that reflected back from the substage condenser and microscope mirror will enter the lamp condenser (C). If the light is not centered there will be a round spot of light somewhere outside the lamp condenser. In that case the mirror must be turned slightly until the reflected light enters the lamp condenser. If the plane mirror is used the spot of light will be nearly circular; with the concave mirror it will be crescentic. C The lamp condenser. / Spot of light outside the condenser showing that the light is off the center.