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.
SCIOPTICON MANUAL. 67 THE EIDOTKOPE. This valuable accessory to the magic lantern consists of two perforated metal disks, which, by an arrangement precisely similar to the chromatrope, are made to re- volve one over the other. The effects are so beautiful as to excite surprise that they should be obtained by a mechanical contrivance of such extreme simplicity. By slow revolution, hexagonal, octagonal, and other geo- metrical figures are obtained, with delicate gradations of shadow; while a more accelerated motion produces the effect of stellate flashings, or scintillations of light. Color may be imparted by the use of tinted films of gelatine. Larger disks can be pivoted to a frame above the condenser so as to give an upward and outward movement to the scintillations as from a lower fountain. Stiff paper disks turned contrary ways by the hands at their edges will answer for practical experiments. MOVING WATERS. Under this title two forms of slides are sold; by means of which, in a single or double lantern, very pleasing effects may be produced. In the simplest form a moon- light scene is painted on a fixed disk, and the " rippling waters" on a piece of glass attached by one corner only to the framework of the slide, which being moved up and down causes the appearance of a ripple on the water. Another more expensive, but more truthful effect, is produced by a slide having.two movable and one fixed disk of glass, and known as the " moving water with eccentric motion." In this slide, not only is the ripple produced, but the heaving of a boat upon the waves, the "rolling " of the sea, and the " hovering" motion of birds is imitated with surprising closeness to nature. 5