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

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336 DRAWING WITH HIGH POWERS [Cn. X FIG. 187. AN ORDINARY MICROSCOPE USED WITH THE LAMP AND CONDENSER OF A MAGIC LANTERN FOR DRAWING OR PROJECTION. W The supply cable from the outlet box (fig. 3). 5 The table, knife switch. r Rheostat of the theater-dimmer type. / The automatic arc lamp. This is the threewire automatic arc lamp of the Bausch & Lomb Optical Company for 5-25 amperes. (For the method of connecting the wires see ยง 704). c Triple condenser with water-cell. a a Principal optic axis. p The concave parallelizing lens to render the converging cone from the condenser parallel or nearly so before entering the sub stage condenser of the microscope. m The microscope in a horizontal position. If it is to be used for drawing there must be a prism or mirror beyond the ocular to reflect the light down on the drawing shelf. b Baseboard with track serving as an optical bench. a s Adjustable drawing shelf on the front of the projection table. proximately parallel light (fig. 150 A. B.), hence it is necessary to render the converging cone of light from the main condenser approximately parallel. This is most easily accomplished by using