Peterborough Collegiate and Vocational School - Echoes Yearbook (Peterborough, Ontario Canada)

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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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'BAVEL Alaska by R. ROBINSON and F. TREBLICOCK, IV A Come with us to mysterious Alaska, Land of the Midnight Sun. First imagine yourself sailing out of Vancouver harbour on the summer evening of July 14. VVe soon leave the harbour lights behind us and proceed northward under the shadow of night. Our first stop is at Alert Bay a little Indian village on the north-east shore of Vancouver Island. We Walk up the one and only street passing many little Indian and japanese children who beg to have their pictures taken. At the end of the street we find our- selves in a Weird old Indian grave-yard which is full of genuine family totem poles. The whole place is very rough and unkept and has an appearance of general desolation. Throughout the cemetery, on the topmost branches of many of the tremendously tall trees can be seen little wooden boxes which contain bodies of babies who died before they were a year old. All aboard! and in a little while we are sailing northward once more. We now cross Queen Char- lotte Sound which is the first stretch of open Water encountered by us and which tests our sea-legs. However, this is soon left behind and the boat docks once more-this time at Prince Rupert. This is our last Canadian port-of-call and here all Cana- dian passengers must make out their immigration cards which are to be presented to the customs ofiicers who board the boat at Ketchikan, Alaska. As Ketchikan is the first Alaskan town we im- patiently wait to get through the customs formali- ties. The first thing that impresses us is the main street which is built of planks. Now let us follow the crowd into a curio shop on the main corner. Our attention is immediately drawn to the thousands of trinkets and Indian tokens which are laid out on the counters and hung up on the walls. There is an exceptionally fine display of rare furs in an ad- joining room, the most outstanding of which are the fine ermine skins. Later we go up to an Indian school on the moun- tain side. Our guide is a little twelve year old Indian boy. He takes us first into a classroom where there are several Indian women weaving baskets. Then we go across the hall into a room where there are many Indian children carving out their family totem poles. On leaving we all gather round the little boy and have our pictures taken on the steps of the school. As we return to the ship we pass a part of the fishing fleet which has put in to harbour for the night. The greater part is, how- ever, too far away to come in daily and only returns at certain intervals. Most of the inhabitants of Ketchikan are fishermen and thus the village is rather deserted in summer. Ketchikan's total population is, at the most, one thousand. Page Thirty Four Talezi Glacier, Alaska. lzzjiaiz Grave- yard, Alert Bay, B. CT. .Medenlzall Glacier at JHIZGCZII, A laska Family Totem Pole Hear Ind- ian Cemetery, Alert Bay, B.C. F isliting Fleet at Ketclz ilaaaz, Alaska. On the following day we reach the famous Taku Glacier. Before the glacier comes in sight we can feel the air getting colder and colder 'and then a blue haze appears in the distance. Soon we can fC0ntinued on Page 90,