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Page 90 text:
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tube, one student's lamp-chimney for a test-tube with the bottom broken outj, two two-hole rubber stoppers, one one-hole rubber stopper, one glass Y-tube, one glass funnel, one Bunsen burner, one I'Ioffman's clamp, and a length of rubber tubing for connections. When the Bunsen burner is lit, the large testtube, or boiler is heated, heating the Water. The water then rises up the length of tubing to the top of the other test-tube, or radiator, where it cools, sinking down the other length of tubing to the boiler , Where it is again heated, performing the same cycle of operations. The purpose of the funnel is to serve as an expansion tank , giving the water room to expand. If there were no room for the water to expand the water would force the tubing apart, Wrecking the apparatus. The purpose of the clamp is to act as a valve, letting the air bubbles, which collect at the top of the radiator , escape. In this Way we are able to heat our buildings by hot water, for when 1V2'ltC1' is heated convection currents are set up, causing it to circulate through the building. The fact that Water can absorb a great amount of heat makes it an economical system of heating. . MECHANICAL EXPERIENCE I had visited the paint shop, electric shop, pottery, drafting and ,wood shopg they were all interesting but the one that fascinated me was the auto shop. In every direction different machines met my eyes. I became very greasy in my zeal to examine the many machines. I soon noticed a boy approaching me. He started to speak to me, but before he could do so, I began asking him a stream of questions. In response to my inquiries, he told me that he took auto shop because he liked machinery and expected to be a mechanic. He went through the entire motor with me telling me how the pistons and valves Workedg why a battery was necessary to make the motor gog and numerous other things essential to the mechanism of the motor. Then I watched the teacher conduct one of his classes. He explained to the boys how to remove a Ford camshaft and how to stretch a Ford valve. We were entirely removed from other interests so engrossed were We in the mysteries of mechanisms. Suddenly a bell rang! All rushed to the business of checking in tools and putting parts of-the different autos away. Soon they were running to the washstand, pushing each other as they splashed and laughed. The final bell rang and they joyously rushed out of the shop to' their next class. I looked after them. Lucky-fellows! I am glad that those who found exploratory work interesting may elect it for further work. Dan Daggett, B9. Sam Downing, AS. Eighty-'four
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Page 89 text:
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SUBJECTS OF INTEREST In our Science Classes, We have the opportunity of choosing some subject in which we are interested and developing it in any way that we wish. Sometimes We arrange exhibits, or give demonstrations to illustrate the topic we have decided upon, but usually we gather information from many sources and write it in the form of a book, drawing pictures or finding illustrations to make our books more interesting and attractive. Among the subject we have chosen to work out have been the following: NATURE STUDY-Bird Life, Butterflies and Their Life Histories, Wild Flowers of California, Insect Enemies to Man, Forestry, Life in the Sea, lVIicroscopic Forms of Plant and Animal Life, Fungi-Their Value to lVIan and the Harm They Do, Termites and How to Control Them, Breeding of Goldfish. lVI1s'1'AL WORK-How to Make Castings of All Kinds. PHYSICS-Communication From the Beginning to the Present Day, Sound Vibrations as Shown by Many Musical Instruments, Time-How and Why We lVIake Our Timepieces and Calendars. CI-ITEIVIISTRY'-'II'1Ol'gZIl'liC and Organic Chemistry. ELECTRICI1'YiAI1 Explanation of the Simples Rules for a Beginner, How We Use Electricity in Our Homes, Wliat We Know About Electricity and Wliat the Future Holds for Us. ARCHAEOLOGY-How the Egyptians Built Their Pyramids, The Mayan People-Their Art, lldathematics, Astronomy and Buildings. TRANSPORTATION-Rocket Planes, The Development of Means of Transportation, A History of Railroads, Boats. AVIATIQN-A History of the Development of Aviation, How a Modern Airport Is Operated. SPEED-Racing Cars and Planes. PLANT FER'r1I.IzERs-A collection of 30 specimens of the newest com- mercial fertilizers, where they come from and how they are made. F IREARIXISLFTOITJ the earliest time to the present, PAl,EON'l'OLOGY-L8 Brea Pits, Fossils and What They Tell Us. Foons-Their Value and How to Prepare Them. CLOTHING-Fabrics, XfVl1CI'C They Come From and How Made. Pmzcrous S'roNEs-Minerals- A Collection of Rocks. RADIO-Higll Frequencies, Short VVaves, Amateur Sending. ASTRONOMY-A Study of the Stars and Planets of the Solar System. EXPERIMENTING IN THE LABORATORY In our science laboratory our teacher directs us in the methods used by scientists. She performs many experiments for us and we are permitted to make many for ourselves. Some of the older boys and girls demonstrate for the younger children. Through the laboratory windows we can keep an eye on our fish pool and see that a proper balance between plant and animal life is kept. VVe study plants and apply our knowledge in the care of our garden. The exeriment illustrated here represents a hot water heating system. The purpose is to demonstrate the method of its working. The materials used are three lengths of glass tubing, two short pieces of glass tubing, three ring-stand clamps, one large ring-stand, one large test- Eighty-three
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Page 91 text:
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Aufomdrive Invesfigafion Learning +o Use 'the Machines Eighfy-'Eve
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