. Elementary chemical microscopy . place, as shown in Fig. 10. Accompanying the instrument is a rheostat so constructed as to permit the lamp to be connected with ordinary house- lighting circuits. One of the great advantages of this illuminating device is the rapidity with which it can be attached or removed from the microscope. The radiant being self- contained there is no loss of time or annoy- ance of properly " lin- ing up " the source of light. The Silverman Illu- minator may also be used with microscopes of the Greenough dou- ble objective type. For this purpose a clamp, Fig.
. Elementary chemical microscopy . place, as shown in Fig. 10. Accompanying the instrument is a rheostat so constructed as to permit the lamp to be connected with ordinary house- lighting circuits. One of the great advantages of this illuminating device is the rapidity with which it can be attached or removed from the microscope. The radiant being self- contained there is no loss of time or annoy- ance of properly " lin- ing up " the source of light. The Silverman Illu- minator may also be used with microscopes of the Greenough dou- ble objective type. For this purpose a clamp, Fig. n, is pro- vided which fastens to the stage of the microscope. The fingers are held back by a ring R, attached to the spindle of the clamp; there is thus afforded an unobstructed view through the central orifice. The lamp and mounting are adjusted below the objective so as to interfere in no way with the field of view. Unless the worker is left handed the clamp should be fastened on the left side of the stage and as far back toward the pillar as possible so as not to interfere with manipulations which may be made upon the stage. The character of the light rays thrown by the Silverman Illuminator is similar to those reflected by the old time para- boloid save that they more nearly axial, in other words the light effect is that of a combination of both axial and oblique rays streaming from an incandescent filament in the form of a semicircle. This will be readily understood by referring to Fig. 12. The dotted lines a, a' mark the points of attachment Fig. io. The Silverman Illuminator attached to the Objective of the Microscope.
Size: 2209px × 2262px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectmicroscopy, bookyear1
