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46 SECTION I. (d) Popular Science (Cont.)
3128 Water Power 1 Reel
Shows the relationship between water power and electricit}'. Water wheels, high and low head developments, hydro-electric generators, the turbine and the transmission and uses of electric power are seen and explained.
3137 Simple Machines 1 Reel
Such simple machines as the lever and the inclined plane are shown to be fundamental to complex ones. Elementary principles of mechanics — movements, work and energy, and efficiency — are demonstrated.
3141 Four-Stroke-Cycle Gas Engine 1 Reel
Demonstrates the "four-stroke" cycle in a single cylinder "T" head type of motor. The firing of a cannon compared with the gas-engine cycle. The fuel system of an engine ; ignition systems of single and mu.lti-cylinder engines, and water and air cooling are showm.
3147 Refrigeration 1 Reel
Demonstrates the ammonia compression system of ice making ; shows the manufacture of 'dry ice,' and the harvesting of natural ice ; and ends with views of the construction of refrigerators.
3155 Frequency Curves 1 Reel
Explains the nature of a statistical frequency distribution, and depicts the reason why frequency curves must be considered as boundaries of an area. Illustrates the fact that the properties of a group of natural objects must usually be expressed as a frequency distribution.
3156 Time and Motion Analysis 3 Reels
A him showing how the timing of individual work in a large factory is used as a method of determining amount and cost of output.
3157 Steam Power 1 Reel
Shows early steam engines and the impro\'ements which made the steamboat possible. Explains simple steam engines, steam boilers and locomotives.
3165 Heat and Light from Electricity 1 Reel
Clearly explains series and parallel circuits, Ohm's Law, manufacture and use of conductors, insulators and lamps, and arc furnaces and heating equipment.
Order by numbers. FOR PRICES SEE PAGE 3