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Eleventh Edition
GENERAL SCIENCE
31
SEIDEN SOUND SYSTEM, Inc.
33 WEST 60 ST., N. Y. C.
%A/E OFFER a complete rental service of sound and silent 16 mm. films and projectors, with or without operators, at attractive rentals. We also sell projection equipment at convenient terms.
Let us estimate on converting your old silent films into modern talkies. We add dialogue, music and sound effects as needed.
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GROUP 25 GENERAL SCIENCE
General Science (Series of 9, 1 or 2 reels each) Titles are Man, Life, Water, Energy and Work, The Earth, Fire and Heat, Air (2), Communication (2), Transportation. (0A146, 202)
Air (1) Physical properties and utilization . (058, 190)
Atmospheric Pressure (1) Divided into two units; Unbalanced Air Pressure; Atmospheric Pressure Varies in Nature. (©57)
Compressed Air (1) Divided into five units; Compressed Air Blasts, Compressing Air, Railway Air Brakes, Air Driven Tools, Compressed Air on Fire Engines. Shows varied uses of compressed air. (©57)
Dewfall — Nature's Jewels (%) Specimens of dew condensation and frost formation under the microscope. (©A30)
Energy From Sunlight (1) As shown in heat, wind and water power, food and fuels. (©57)
Fire and Heat (1) Physical properties and utilization.^ (©58)
Fire Making (1) Traces modes of fire making, and shows how matches are made. (©57)
Frequency Curves (y2) Correct interpretation of a frequency curve as a limit to a process of sampling. Application of formulas. (©57)
Hot Air Heating (1) Divided into four units: The Fireplace, The Stove, The Furnace, Summary Review of Heating Devices, Advances in heating devices traced to present day systems. (©57)
Limestone and Marble (1) Divided into three units: Natural Limestone, Artificial Limestone, Marble. (©57)
Liquid Air (1) How it is produced; experiments. (©29, ©AA78, A197)
Making of Dry Ice (1) Self-explanatory. (©129)
Mold and Yeast (%) Specimens of mold on fruit, leather, clothes and bread — the way in which molds grow, develop and germinate. (©57, 104)
Mysteries of Snow (1) Different kinds of snow crystals. (©A30)
New York Water Supply (1) Divided into four units, emphasizing necessity of a water supply sufficient to meet the requirements of millions of residents and commuters and numerous industries. (©57)
Purifying Water (1) Treats city water from lakes, the removal of sediment from waTer, disinfection of a city's water supply. (©57)
Oil Films on Water (Technical) (5) Dr. Irving Langmuir performs and explains many experiments ; excellent close-ups. (A78)
Sand and Clay (1) Divided into three units: Sand, Glass, Clay. This film in conjunction with "Limestone and Marble" and "The Formation of Soil," gives the child an understanding of the rock-soil cycle in nature and commercial significance of minerals involved. (©57)
Science of Bubbles (1) Explanation of formation, structure and behavior of soap bubbles. (A48, 197)
Water Cycle (1) Illustrates circulation of water from earth to sky and back to earth again. (©57, 58)
Water (1) Study of some of natural properties. (©58, 190, ©A197)
Westinghouse News Reel (1) Novel accomplishments in science (A 194)
Wonders of the Sand (%) Various kinds of crystals. (A197) (See also Groups 18, 21, 63, 64, 68-76, 100-101)
The Educational Screen does not handle films.