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Page 46 text:
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Television by R. HISCOX, II F Ind. A. Many are the results of man's ingenuity through recent years, and many have been his accomplish- ments. Perhaps the most recent invention of modern time is the radio, which is truly marvellous in every sense of the word. However, we are more interested in radio's most recent development-- Television. Television, although still in the experimental stage in Canada and in the United States, has ad- vanced considerably in Great Britain. There, television broadcasts are being executed by the British Broadcasting Corporation, which presents four television broad- casts per week. These broad- .S-urcfiff Af FOI' liimfnznrvg face af is directed into the cell, it gives forth an electric current. This current when used with special equipment can be made to perform remarkable feats which I cannot relate because of limited space. In television transmissions, a photo-cell is used to convert light changes into varying electric currents. These currents travel to the radio station where they are changed into radio waves. These waves are transmitted over the ether, and are received through a radio receiver, which changes the radio Waves back into electric currents. For television purposes we supplement the radio loudspeaker with a television re- ceiving appara- oifetgg, F tus of which casts are under J A Nant' there are several the supervision Z 4 0 ditferent kinds. of Mr. john L. aj The simplest Baird, who was r, ,B X Iv. vgggrgfgij, form of televis- the iirst success- 76' .1 3 3: - . R':Z,,ff,'5iD,,M1 0 , ion receiver con- flll lI1V6I1t01' of pzqf LIT: l I 0 5i5t5 Qgsentially television. In Or- - L' 1 - . ,,m1,,,.6f of a revolving der to unravel 'miie A 21' VV ve ' ' dm disk through the mysteries of 1,114 Pew-s R A which holes are television, we ?:,,,f ma me arranged in the must first un- ' as form of a s iral. ravel the myster- PAUL, . aka ENC - ref? E Behind thigpdisk ies of the most l nf,1Q'f!ZI'f is placed a spec- wonderful inven- J ta I ial neon lamp, tion of the elect- Qbiiafbfilfffntg .i ,. A similar to the red rical scientific X- H , 7 Q Rffljer neon signs visi- world - the el- S ' ible on our main tric eye, technic- A R 0 0 O street. The neon ally known as the photo - elec- tric-cell. The photo-cell in its most sim- plified form consists of an element, composed of a wire rod, or anode, and a cathode plate, which is coated with certain chemicalshaving light sensitivity. This element is enclosed in a glass tube, from which has been pumped most of the air. The photo- cell, like human beings, can work much better in the light than in the dark. Therefore, when a light jrujcas img .ffnfioh This drawing is lypfw! of 1116 simplest farm qf teleziiazion apparatus. lamp, being very sensitive to small electric currents, reacts to the el- ectrical impulses sent out by the radio receiver. Thus, if the appara- tus is properly tuned to the transmitting station the picture being broadcast will be seen by looking through the holes in the revolving disk. The sketch will, I trust, further the reader's knowledge of television from tower to screen. Wonders of Science Nothing shows better the immensity of the field of science than the greatest and smallest of its units of linear measurement - the light year and the angstrom. The iirst is equal to the distance travelled by light Cspeeding at 186,000 miles per secondl in a year, while the angstromis1!10,000,000 of a milli- meter. The star we know as the sun ranks among the more inferior lights of the universe. To show just how insignificant it really is, astronomers have esti- mated our entire solar system, sun and all, could revolve WITHIN the space occupied by a gigantic star such as Betelgueux. Page Thirty-three
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Page 45 text:
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lnterview With a Fire Ranger A Few Words With the Guardian of Ontario's Forests By BETTY DETCHER, Sp. Com. With trembling hand, I opened the door as my host called cheerily, Come right in. I was not nervous but stronger hearts than mine had quaked at the mere thought of ascending the tiny ladder which leads up to a fire ranger's tower. I looked back once, waved to my more timid companions on the the ground below, and entered the stronghold of one of the guardians of our northern forests. Kirk Adams is a typical member of that great body of men who stand guard over the northland. He is very kind and friendly, and willing to answer any questions about his work. How long have you been a ranger? After I had assured him I wouldn't ask his age, he answered slowly, Twenty years. I came up here when there were no roads, only a winding trail through the forest. The last twenty miles were covered in canoes. Why did you choose this type of work ? I asked, wondering why a man born and educated in the city should wish to forsake it as this man had done. The old story, he replied with a laugh, Ad- ventures, thrills, you might say,-'the call of the wi1d.' But there isn't the same thrill now that ex- isted when I first came out here. We have aero- planes, radio, and motorcars to assist us in our work, and it is not so lonely since highways have been built through the forests. For the same reason, he added, Our work has been greatly increased. There is always the careless camper or motorist who leaves behind him a glowing cigarette butt or the unquenched embers of a campfire. Kirk was growing more and more excited as he denounced the thoughtlessness and indifference of some of the tourists who travelled through his be- loved Algonquin. Suddenly he stopped speaking, and, holding up his hand for silence, picked up from the table a pair of powerful binoculars with the re- mark, Look just to the north of the nearest moun- tain, and tell me what you see. At first I could see nothing strange, but as my eyes became accustomed to the powerful glasses I could detect a thin column of bluish-grey smoke ris- ing from behind the mountains. Smoke .,..... . Smoke! l I shouted excitedly, Hurry ...,.... do something !' ' The ranger laughed at my excitement and calmly bent over the radio. Tap-Tap-he repeated the message as he sent it out to headquarters at Whit- ney, twenty miles away, 'iSmoke rising at White Mountain-Investigate, Adams. Turning from the radio he said to me, Now watch the sky over there. Almost before he had finished speaking two aero- planes came in sight, flew to the place from which the smoke was rising, dropped chemicals to ex- tinguish the flames, and fiew off again. Continued on Page 865 Page Tlzirty-two The Man Who conceived a New Universe Einstein, the Worlc.l's Foremost Scientist by HUGH KENNER, II C Ac. His reasoning is the result of one of the highest achievements of human thought. The speaker was Sir joseph -I. Thomson, who was certainly not given to uttering ill-considered words. The thinker referred to was Albert Einsteing his achievment, the General Theory of Relativity. Greater mathematicians than this shock-headed German jew have existed, certainly greater ex- perimentersg but he srupasses them all in the qual- ity of his imagination. Michelson it was who performed the preliminary experiments, and it was Minkowski who gave the Theory its elegant mathem- atical dressg but it took the genius of Einstein to frame for the world a new conception of the universe. Einstein was born in the city of Ulm, in southern Germany, in the year 1879. So backward was he at acquiring the ability to walk and talk that for a time it was feared that he was mentally deficientg on the other hand, his first sight of the compass needle's mysterious persistence made him tremble and grow cold, Perhaps it was then, at the age of four years, that he had the first premonition of the greatness that was to be his in the scientific world. Be that as it may, he soon entered school at Munich, fifty miles from his birthplace, where he distinguish- ed himself in mathematics and in little else. At this time a textbook on geometry, which was not then a school subject, fell into his hands, and he took great delight in working out the problems it contained. At the age of fourteen it was manifest to those who knew him that he was a mathematical genius. After some time the family moved to Italy, whence he was sent to Switzerland to enter the Zurich Academy. Failing completely in the entrance examination, the man was to be ranked with New- ton and Copernicus was forced to do plenty of cramming and submit to a second test before being accepted. Meanwhile, in America, great things were hap- pening in the world of physics. It had long been known that the human creature has no sense of ab- solute motiong he can detect change of position only by reference to some fixed outside point: that is, only relative motion can be sensed. In 1887 Michel- son and Morley performed their famous experiment to determine the velocity of the earth relative to the ether. Their apparatus was almost incredibly sensitive, but the experiment failed completely, and the scientific world was thrown into a quandary until Hendrik Lorentz proposed his Contraction Hypothesis, which partly solved the difiiculty. When Einstein was in his second year at the Academy, he began to see his way clear to a solu- tion of the problem which had been set the scien- tists, and when he left the Institution and started work in the patent office at Berne he evolved what we know as the Restricted Theory of Relativity, published in 1905. CContinued on Page 805
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