Show U S television hits new high in development broadcasts now on regular schedule from new york prepared by national ge geographic society washington D C W US service ervice television broadcasts in the united states are now 0 on n regular schedule and manufacturers rs have begun the wholesale production of receiving sets as the american public begins to realize the value of this new form of education and entertainment the inaus inaugural ural telecast in this country was produced on april 30 1939 when president roosevelt opened the new york worlds fair air since then television has launched into the air an eye and ear witness impression of the king and queen of england visiting the fair air of a canary circus of a baseball game a boxing bout a ballet a swimming contest a marionette show a six day bicycle race the docking of the new liner a track meet and a fashion parade experts point out but that important differences between radio and its 0 sister ister science of long distance seeing place difficulties in the way of a nationwide nation wide television network to parallel radio hookups yet the american people who promptly invite each new scientific marvel into the living room are showing a lively interest in television although the majority of them are still beyond the reach of current programs twenty tubes to set television has put into american homes the most complicated instrument yet devised tor for popular use a radio set plus it has about 20 4 J jj t MASS production with television sets now on sale at regular retail prices manufacturers have begun assembly line production of receiving units this picture shows standard instruments n st in the process of being assembled tubes one of them Is the g giant lant cath cathode ae ray vacuum tube 27 in inches c hes long that creates the television picture on the top of its flattened bulb by means of a tiny pencil of streaming electrons it has sound controls for volume and high and low pitch adjustments it has sight controls for focus speed size and centering adjustments adjustments of the picture television has also put into circulation a new vocabulary telecast to correspond to broadcast video frequencies quen cies as differentiated from the sound wave frequencies of radio like ike instead of mike for the which corresponds to radios microphone ultra short waves used from the giant antenna on the empire state building a quarter of a mile above e the earth the radio waves that carry the sound part of the program are launched into the air exactly as in ordinary short wave radio transmitting the waves that carry the visual part are of such high frequencies that instead of kilocycles kilo cycles thousand cycles they are listed in mega I 1 cycles million cycles sound even em that of a symphony orchestra usually is transmitted in a group of frequencies quenches quen cies snot not more than cycles wide but a good television image requires frequencies jumping from so 30 to cycles within a seconds on ds time in addition two series erles ot of waves synchronizing impulses must be broadcast to keep receiver and transmitter in perfect step A leg lag of less than one millionth of a second in the receiving set would make In perfect television pictures from the outset it Is apparent that television is at least three times as ai complicated as radio cadlo an added difficulty is the fact that the very high frequency television waves do not bounce between the e earth arth and a reflecting layer in the sky as do the longer waves used in sound broadcasting such repeated reflection permits radio waves to reach tar far over the horizon in fact to follow the curvature of the earth completely around the globe television waves shoot straight os off through the reflecting layer into BEAUTY AIA MAKEUP KEUP the young lady clad in war paint is not preparing for a part in a horror thriller but is merely making up for a regular television broadcast special skill in the use of rouge and paint is required to give good picture reproduction in telecasts tele casts outer space and are lost they usually cannot be captured by television sets much beyond the horizon draw a straight line represent representing in 9 the path of 0 television waves from any point on the earths surface and you will recognize that they soon part company with the curving earth to be sure of viewing in on a television program therefore a receiving set should be close enough to the transmitter to be within the television horizon from the lofty antenna on the empire state building sets within a radius of 0 55 miles regularly receive the program as well as some sets from to to miles away resembles ordinary ordinary radio outwardly the television receiving set most generally in use resembles a large radio console with an extra row of buttons and a propped up lid the television image a vision indeed appears beneath the lid where the televised scene in perfect miniature comes to life on a glass plate 8 by 10 inches presiding genius of the television r receiving ec elving set Is the 27 inch funnel s shaped h aped vacuum tube standing upright like a lily As a loud speaker translates silent radio waves into sound this tube translates invisible waves into a visible picture its narrow stem contains an electron gun primed with cathode ray ammunition its broad top is capped with a glass plate curved to shield the vacuum within from the atmospheric pressure above the under surface of the glass is coated with a chemical mixture zinc sulfide which is capable of fluorescing emitting light when struck by electrons an electrical impulse from from the transmitter modulates the beam or ray fired from the electron gun when the electrons hit the fluorescent surface the glass shows a tiny po point of light which is bright or dull according to the intensity of the modulated beam of electrons two miles billes a second the electron stream is shot in machine gun sequence across the face of the plate from left to right at a speed ot of two miles a second then it zips back to the left at double quick time and repeals the bombardment bar dment with about shots in a row it makes trips from left to right to fill in the picture completely from top to bottom this action is controlled by electro magnetic force whether each tiny shot of the electron bombardment Z AID IN CRIME WAR here is a test telecast being made to determine the value of television in criminal identification by bk reproducing fingerprints officials claim that in cases where speed is important fingerprints could be broadcast to operatives awa away y from police headquarters eliminating ti 9 the delay caused by y mailing the prints to a central bureau bureau registers as light or shadow Is determined ter mined by what the television camera has revealed of the object being televised the scanning lines tor for each picture are completed too quickly for the human eye to detect the electron pencil in action and the resultant illusion is comparable to the illusion obtained from the movies which project 21 still pictures per second to create the impression of movement the television image is created by a rapid succession uc cession of 30 complete pictures per second |