imes in thickness to secure which is shortened in the direction of rotation to one- a line of normal width in the instrument. The spaces fifth its real dimensions, while it is multiplied five times. BY GEO. M. HOPKINS. in the distorted figure representing the shaded squares There are two methods of… … C PRODUCES D. are placed on a large rotator about twenty-five feet the well known opti- from the lantern, and in the lantern slide holder is cian, Mr. T. H. Mc- Fig. 5. placed the rotary disk shown in Fig. 8. This disk, Allister, of this city, which is provided with four narrow radial slots, is an…
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