X-RAY PROCESS.

Manawatu Standard, Volume XLV, Issue 101, 30 March 1925, Page 12

X-RAY PROCESS.

DEVELOPMENTS AT WOOLWICII. LONDON, Jan. 29. Dr. E. V. Pullin, director of the radiological department of Woolwich Arsenal, in delivering the second of the series of Cantor Lectures at the Royal Society of Arts announced that the great need in X-ray research was to increase the voltage of tho tubes, becuuso if voltage could only bo increased the penetrating power of X-rays could be similarly increased. It was possible at present, he said, to examine threo inches of steel castings, but a machine hud been devised at \\ oolwich that operated at 400,000 volts instead of 200,000 volts, and could detect flaws in eight inches of steel. Means had been devised so thut not only should advantage bo taken of the peaks of the incoming current, but that the valleys of the same currents should be transformed into peaks, and that the intermediate values should be stored and discharged by means of condensers. These machines were now on the market, but the last word had not been said about thorn. The high voltage tubes bad certain very sensitive points, and at oolwich they had now succeeded in producing a tube which protected by means of hoods this delicate portion of the tube from an accumulation of positive ions and so preserved it. The high skill, the infinite patience, ai d tho reiterated failures which characterised research work in the problems of radiation should stimulate those who were devoting their lives to that specific branch of physics 1