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NEW DEVICE TO AID STUDY OF SHORTWAVES
An invention announced this week by the Bell Telephone Laboratories is expected to aid the study of disturbances in short-wave radio transmission.
By enabling astronomers to study the activity of the solar corona the flaming halo around the sun the device will permit the forecasting of short-wave interference which origi¬ nates in the sun.
The machine was invented by Dr. A. M. Skellett of the laboratories. It has been successfully tried out in the private observatory of Dr. G. W. Cook at Wynnewood, Pa.
The new system or machine, named the "coronavlser”, uses the principles of television, which can discriminate between steady light and variations. In effect it "scans” a ring around the sun, discarding the light from the sun itself and throwing on a cathode ray reproducer only the image of the corona. ’This was impossible with ordinary apparatus because the main body of the sun is a. million times brighter than its luminous envelope.
In the actual operation of the system in Dr. Cook's observatory it was discovered that almost perfect conditions of cleanliness of reflectors and lenses must prevail to get a true image. The slightest smudge or grain of dust on the glass plate supporting the scanning hole unit showed up on the reproducer.
Occasionally tiny specks of brilliant light would float across the screen, the sources of which were puzzling. They fin¬ ally were traced to wind-blown seeds or specks of dust drifting across the path of the light reflected from the siderostat mirror into the eye of the sca,nning system.
The real worth of the corona viser, the Bell Laboratories said, will not be definitely determined until it has been used under the clear skies encountered on mountain tops, where the principal observatories are situated, and where a telescope point¬ ing directly at the sun can be used. At Wynnewood, only a hori¬ zontal mounting was feasible. This, the inventor said, caused considerably more glare than will be encountered in a vertical mounting,
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LONDONERS REGRET TABU ON TELEVISION
"It has been pointed out to us that nobody said a word in the Radio Time s about the passing of television", the Radio Time s , of London, comments. "That is quite true, but so many things were passing, too, on that ominous week-end at the begin¬ ning of September, that television was at least not singled out for neglect. As a matter of fact we ourselves, as viewers, miss television a.s much as anybody could. It seems to us tha.t it would have been the ideal entertainment for the black-outs something to keep you happy that does not mean going out, that does not cause crowds to collect, and th^^t you can enjoy in a darkened room. "
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