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SATURDAY, MAY 2, -1925. (FEATURE SECTION).
Radio Notes & News.
Recent Advance In Television Discussed.
U. S. HEARS P. 1. PROGRAMME. Detroit Listens in to Manila.
The Radio Corporation of tho Philippines broadcasting pro- gramme put on the air the night of March 18 was picked up in Detroit, Michigan, according to a latter received by the local cor- poration yesterday from a Detroit. to be transmitted it le necessary radio enthusiast, who states that that it should be very strongly he heard the local programmewith This in further the aid of a homebuilt Tridine illuminated. accentuated by the absorption of radio set, reports the Manila Bul light that occurs in the lensos. Tetin of April 24th.
Officials of the corporation said At the receiving end the source
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The rapid developments in the wireless transmission of signala, particularly of speech and music, consequent on the discovery and uso of the thermionic valve and its more obvious possibilities, have boon so popularised as to obscure of light must be controlled by the the time listed corresponds to that. somewhat the brilliance of the receivad electrical impulses. The of a special concert programme original work underlying tho dis- most satisfactory method of doing given by St. Theresa's Academy coveries and to minimise the this is by some direct electrical at 8:15 p.m. on that data. They difficulties overcome by workers means which will not suffer from also said that similar letters have recently from in this field, says a radio engineer ill-offects due to time lag, which been received in the Manchest.r Guardian Com-ideally should be absoat and various other points, one of them which must be almost infinitosima small town in New York state mercial...
The social advantages and al if satisfactory results are to and another Chicago. commercial opportunities oponed be obtained. If possible, it is up by the successful development desirable that the lamp should of radio telegraphy and tele-be operated by the amplified phony, ahd particularly the suo-signal currents, and, failing this, Coss of the wireless broadcasting that the Illuminating system soberce, bave directed attention should be directly controlled by today picked up Station IAA at to the desirability of a successful them. Glow discharge lamps are Auburnale, Massachusetts, the commercial form of television. available with very small time first time that a local amateur The public desire for the accomplag, but these are of such small radio onthusiat bas achieved such lishment of such a system is intensity as to limit the size of long distance results. He also allied with an oxpectation of ite the receiving apparatus very de communicated with Stations 6R jearly fulfilment without a full finitely. Any development of W and 6TS in California and realisation of the obstacles to be television on a large scale must other stations along the central surmounted before effective tela- be preceded by the development Pacific coast.
He is now experimenting with vision can be realised. The com- of the technique of glow dis-
10 offort to paratively recent demonstrations charge lamps, so that high candle shortwaves in
establish two-way transmission in America of practical systems power lamps can be employed, in for the transmission of photo-the receiving system, unless use between China and the United graphs have led to the can be made of indirect optical
Some months ago the radio sta SOUTH CHINA KNITTING FACTORY raising of many false hopes of projection apparatus, such as is!
This latter tion here on the American consu this being speedily followed by already available.
Hosiery Manufacturers late picked up the Chicago apparatus for telovision, though system, however, would bo a faller understanding of the pro- further complication and expenso, Tribune station in Chicago, but various colours
this is thought to be the first blems involved shows that in and is to be avoided if possible,
amateur success at such long and sizes.. many ways the two problems of
In order to obtain reproduction distance communication by radio Excellent telephotography and television
of detail the staggering of the and is arousing much interest Quality. are quite separate and distinct.
The successful forms of ap-lenses beeds to be arranged ac-and is stimulating radio interest paratus for the transmission of cordingly, and unless soms re-here... pictures take from ten to fifteen ciprocating motion is given to the minutes to. transmit one of system as a whole it is not clear ordinary dimensions (for ex-how the large number of lenses ample, about six inches square), necessary is to be accommodated while for television it is necessary on the disc. Furthermore, this that such a picture. should be would entail a very high speed of nineth annual convention, of the for the interrupting American Newspaper Publishers transmitted in less than one-tonth rotation
A
States.
AMERICAN PUBLISHERS.
Urge Radio Broadcasting. New York, April 22.-The thirty
of a second, and preferably in slotted disc in front of the light Association opened today with: half, that time. Furthermore, sensitive dell. For a 6in. square 600 publishers in attendance. such systems depend on compara-picture, divided into elements Nowsprint and labour problems tively weak light signals at the one-hundredth of an inch square, were discussed by President Reports of twelve committee receiver, and use photographic in order to pass the whole picture Thompson in his address. filme to record them, so that on a over the cell in one-tenth of a larga scale good visual reception second. the disc would have to were submitted, including that is not possible with the apparatus rotate at a speed of at least 10,000 on radio dissemination. The com- r.p.m. even if the diso contained mittes report discussed at length at present used.
360 slots, and it is difficult to the effect of radiocasting on EFFECT OF STAGGERED LENSES.
Various methods have been see how this could be managed newspapers, asserting that the
Buch
from dissemination of important events freedom 'with proposed from time to time for securing television, and the sub-vibration that accurató regis-by radio serves as a atimulus to joct has lately come into pro-tering of the image could be circulation rather than a deter- minence through published state-obtained. Similarly, with any rent.Associated Press. monts of the work of. J. L. reciprocating motion on the shaft Baird. Amongst other previous carrying the lens, disc vibration workers in this field of recent would be encountered, and it youre have been A. A Campbell-romains to be seen whether this Baird can be kept within the limits Swinton and D. Mihaly.
to necessary
permit faithful and Mihaly have oth constructed
transmission and reproduction. experimental appartus with which results, though crude, have been DISTORTION POSSIBLE. obtained. The Baird transmitter
Another feature of the rotating consiste of a rotating disc carry ing a number of nees staggered disc systera is that at the receiv radially, the lens throwing an ing end, with a pure rotatory image of the object to be trans-movement the reproduced image! mitred on to a light sensitive will not be rectilinear but will be built up of area and radii of element, in front of which is a
lotted rotating disc, the effect of circles. This can be overcome
THE COLONIAL DISPENSARY. the combination being to excite in several ways, but any such
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the light sensitive element with a complication will always bel series of impulses corresponding possible cause of distortion in to each part of the picture. The the reproduction, affect of the staggered lense is to With any system in which time impress on the cell, in strips, an lag is of prime importance any image of the object to be trans-inertia of the moving parts will mitted, the strips being further tend to produce, distortion, parti- be subdivided by the rotating slotted cularly if suob movement diso.
reciprocating, and the most pro- These electrical impulses are mising line of development free transmitted in the ordinary way from this defect seems to be one though difficultiesdue to electrical in which use is made of the lack distortion are of great importance, of inertia of a stream of charged and, if anything, more important electrical particles as the moving than they are in the case of element: Such a system is that the transmission of sound. The propounded by Mr. Campbell- receiver operates in a similar Swinton.
manner to the transmitter, ex- All the systems put forward up cept that slots in a rotating disc to the prosent depend on con- replace the lenses in a similar gidered electrical amplification dise at the transmitter, Synch for their operation, and this must ronism is affected by having as he distortionless, in addition to alternating current generator on which the electrical system must a moving shaft at the transmittor, be highly damped if deleterious transmitting the curront so pro results are not to be introduced duced by a separate aerial on a by this means. In view of the different wave-length to the romany subsidiary problems to bo eiver whore it is used, not as the solved it does not appear that main source of power to drive the any auccessful practical com- motor, but as a synchronism merolal system of television will agent. With the addition of a be developed for years to come, driver for securing correct phase whilst the production of a simplo relation, synchroniam can thus system that could be produced at bo effectively scoured, and the a reasonable cost and not requir aparatus will undoubtedly give ing highly skilled manipulation television, though in ita ex-
eoems entirely out of the question, perimental form the results aro necessarily very crudo,
DIFFICULTIES AHEAD.
Commodoro Bir Bertram. For Consideration of certain Hayes has been appointed a features of the apparatus, how director of the Marconi Inter- ever, shows that whilst the main national Morino Communication principles of the invention are Company. Bir Bartram retired sound and very simple, many from the position of [difficulties will have to bo over modore of the White Star Line come before the apparatus can at the end of last year, after, a tako a satisfactory commercial caroor covering 35 years with the form. As the source of light at the line, 26 of which were spent in outsot is the object whose image is command..
com-
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