We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Bausch 8c L omb Optical Company When projecting opaque objects, the maximum illumination obtainable from a single light source is obtained by direct lighting of the object without intermediate reflection and by decreasing the distance between specimen and illuminant. This is accomplished by tilting the lamp house as in Figure 3, the strong spring catch holding it in position. This throws the light directly down on the object, which is held against the opening in the floor of the dark chamber by the strong springs of the object holder. There is only one mirror reflection, that by which the light passing from the object through the projection lens is directed toward the screen. This reflection at the same time causes the image to appear in correct position, from left to right. This reflection is caused by the mirror in the dark chamber mounted on lower side of mirror carrier used in lantern slide projection. Vertical Attachment Figure 4—Universal Balopticon, ERVA 15, Showing Vertical Attachment and Medium Microscope, 4250 U. With the addition of the vertical attachment organisms in water, physical, chemical and biological demonstrations, or any subjects which must be placed in a horizontal position, can be projected on the screen. This equipment, shown in Figure 4, is mounted on one end of a rectangular plate, which slides on metal rods over the opening in the top of the dark chamber. The mirror box and equipment for lantern slides is mounted on the other end of this plate, and to change from one to the other it is simply necessary to shift the plate by means of a convenient handle. The position of the movable mirror carrier within the dark chamber is the same for either lantern slide, opaque or ver- tical projection because of its two reflecting surfaces. 61