Early History of Cosmic Ray Studies: Personal Reminiscences by Yataro Sekido, Harry Elliot

By Yataro Sekido, Harry Elliot

On the celebration of the foreign convention on Cosmic Rays held in Kyoto in August 1979 5 elderly participants of the cosmic ray fraternity, H. Elliot, V. L. Ginzburg, B. Peters, Y. Sekido, and J. A. Simpson met jointly as a cocktail party dedicated to the joy of jap delicacies and recollections of our more youthful days. This friendly social gathering referred to as to of our personal age in addition to a few eminent seniors now not current on the brain the numerous associates convention whose memories may have extra enriched and enlivened our night. by the point the dinner got here to an finish we had agreed that the compilation of a extra wide choice of own memories will be a fascinating and priceless project. for this reason, tomorrow we held a piece of writing assembly to attract up a listing of strength authors and folks, the current editors, begun paintings at the venture. In placing the booklet jointly our goal has been to attempt to catch and list via those own money owed anything of the ambience, the buzz and the frustrations of analysis in cosmic rays as skilled before everything hand through many of the practi­ tioners within the box. It hasn't ever been our purpose that it's going to include a scientific background of the topic. Neither, regrettably, can it's a completely consultant assortment considering the fact that useful limits to the dimensions of the quantity by myself might avoid that.

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Physik. 22/2, 159. Geiger, H. : 1928, Naturwiss. 16,617. : 1928, Naturwiss. 16,1044. : 1927, Z. Physik. 43,354; 1929, Z. Physik. 54,686. : 1946, Z. Naturf. 1,50. PART 2 MEMORY OF REMOTE DAYS THE EARLY STAGE OF COSMIC RAY PARTICLE RESEARCH Dimitry V. SKOBELTZYN* What follows is a brief account of "personal recollections" pertaining to the pre-history of cosmic-ray research, written by probably the oldest living participant of the scientific events of that period. In 1927, I published photographs of secondary electron tracks produced by a beam of'Y rays in a Wilson cloud chamber placed in a magnetic field (Skobeltzyn, 1927).

At that time, I was not interested in cosmic rays. I was, however, aware of the work being done in this field. One of my older university colleagues, Leo Mysovski, perfonned many important experiments in studying cosmic rays, called at that time "Hohenstrahlung". To him and his co-worker Tuvim belongs, for instance, credit for discovery of the "barometric effect" exhibited by this radiation. The highlights in this field of research at that time were the very important results of the experiments by Robert Andrews Millikan and G.

The lead shields were used to reduce local radiation. (Courtesy of the Archives, California Institute of Technology for caption also) R. A. Millikan and G. Harvey Cameron 1925. 1924 - "Stone age" of the nuclear physics. The first observations of the Compton-effect of 'Y-rays with a cloud-chamber in a magnetic field (about 1000 gauss). Contributed by D. V. Skobeltzyn. See p. 47. D. V. Skobeltzyn in the photo was 32 years old. The arrangement, used since 1925-1926, with a magnetic field of 1500-2000 gauss.

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