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.
48 SECTION I. (d) Popular Science (Cont.)
sweets. The system ol feeding, cleaning the cages and charting of growth records are given in detail.
3217 Weather Forecasting 1 Reel
The process of collecting, tabulating and interpreting of weather data obtained ivon\ observations and instruments is demonstrated. In animation, a procession of low and high pressure areas moves across the United States from west to east.
3223 Optical Instruments 1 Reel
This film shows the optical principles of : — Mirrors, the Ej'e and Spectacle Lenses ; The Camera ; Stereopticon and Moving Picture Projectors ; Microscopes and Telescopes.
3225 Lenses 1 Reel
Emphasises those phases of lens refraction that can be admirably shown by animation ; properties of a convex lens, real and virtual images, changes of magnification ; effect of a concave lens ; formation of the \irtual image ; construction and explanation of achromatic lenses.
3226 Illumination 1 Reel
Records the principal methods of lighting. Shows the principle and the use of the photometer and the foot-candle meter ; depicts the cause and correction of glare in home and factory, and the character of direct, indirect and combined systems of lighting.
3264 Formation of Soil 1 Reel
Introduces the student to the "rock-soil" cycle by means of demonstrations, animations, and actual photography. The story of the disintegration of rock includes the work of the weather, stream erosion, glaciers, wind and waves, rain and air, and plants and animals.
3291 The Nitrogen Cycle 1 Reel
Pjcginning with a shot of dynamite in use, tiiis him traces the action of nitrogen in agricultural life. It depicts the production of nitrogen byplants, conversion by animals into tissues, and its return to the soil.
3292 Carbon Oxygen Cycle 1 Reel
How fuels are made ])y green plants is the subject of the hrst part of this film, while the rest is devoted to the carbon comi)(;unds of food.
Order by numbers. lOR PIUCUH SHU PAGli 3