International Review of Educational Cinematography (Jan-Dec 1931)

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




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.

— 1004 — sorian, and attach our screens so that half the tank is yellow and half blue. In darkness the organisms will be evenly distributed in the water. Allowing a weak light to fall upon the tank the creatures will probablv congregate beneath the yellow. If now, an intense light is turned on they will pass over into the blue section. Now from the photographic point of view the whole tank is equally illuminated, therefore it will obviously be to our advantage to employ the blue screen when handling that particular organism. Screens sufficiently good for the purpose in hand are made by fixing photographic plates, washing, dipping in very dilute Hydrochloric acid, thoroughly washing and dyeing. Many colours will be found useful, but methylene Blue is especially valuable. In the case of this dye the plate should be rinsed in very dilute ammonia after the final washing. A further refinement may be effected by combining an independent screen of Acid Green with the methylene Blue, thus eliminating the red band passed by the latter. I am not, of course, recommending these two screens at their full theoretical monochromatic density, as the light transmitted would be altogether insufficient for our present requirements. Tiie flicker light is a purely mechanical device, and very valuable where it can be employed. A replica of the camera shutter, exactly synchronized with it, is placed between the source of light and the object. The specimen is thus illuminated only whilst the camera is actually taking the picture. The light and heat walling upon the object are thus reduced by one half, whilst the camera loses nothing. This device is especially valuable when working with sunshine. In the case of high power work vibration is very difficult to avoid. A recently constructed outfit which has given satisfaction is based upon the idea of having the microscope and camera quite separate, each on croncrete bases in the open. A tube from the camera front carries a light trap, and one from the microscope enters this trap, but there is no actual contact. This apparatus was used with sunlight flicker and gave not a trace of vibration with a magnification of several hundred diameters. The field of Kinephotomicrography is such a vast one that no useful purpose would be served by attempting to enumerate its possible applications. The marvellous structure, fascinating habits, surprising beauty and innate cussedness of minute organic nature I will leave for others to discover, amd at the moment merely indicate the practical handling of two subjects, one in which movement is visible, and one in which it is not. For a type of the first kind we will take Cyclops, a small crustacean, quite visible to the naked eye, which can be obtained from almost any pond. Selecting a locality where Cyclops is abundant, and if possible where there is a minimum of other creatures of about the same size we net a quantity of material using the cone of millers' silk with a glass tube at its apex familiar to pond-life enthusiasts. By means of submerged seives everything is washed