Radio broadcast .. (1922-30)

520 Radio Broadcast penetrates, and is only recommended on the heavier panels. The shielded receiver as it now stands, will prevent any undesired effects due to the coils picking up energy, but we may still further utilize shielding to prevent undesired coupling between circuits, which often causes erratic performance of the receiver. To shield a receiver internally it is necessary to cut a piece of wood to form a partition, and covering one side and the rear edge with copper foil in the manner described. This should be placed in the proper position and secured to the rear and sides with flat head wood screws countersunk flush with the surface. This shield should then be soldered to the shielding in the rear of the cabinet. The internal shield should be so placed as to separate the coupler from the plate variometer, and should be equidistant from both if possible. The front edge of the internal shield should extend not quite to the front of the box, a space of approximately one inch from the rear of the panel being allowed for the necessary wiring to connect the apparatus in the two sections. All wiring should be covered with varnished tubing 'and kept as far away from the shielding as possible. It will of course be necessary to modify the above directions somewhat to suit conditions, especially if the shielding is going to be applied to a receiver which is already constructed, but if the general scheme is followed out, the operator will have a receiver which tunes sharply, which is unaffected by induction noises of any kind, other than those picked up by the antenna, and which performs in a consistent and efficient manner. Radio Personalities V COMMANDER STANFORD C. HOOPER, U. S. N. By DONALD WILHELM Commenting on Commander Stanford C. Hooper's article " Keeping the Stars and Stripes in the Ether," which appeared in the June number of RADIO BROADCAST, Mr. Owen D. Young, Chairman of the Board of Directors of the General Electric Company, said: "Commander Hooper did not do himself justice, as, indeed, it would be impossible for any modest man to do himself justice under similar circumstances. The facts are that the initiative which brought into being our American radio policy and resulted in preventing us from being outdistanced by other nations started with Hooper. It was he who spurred on Admiral Bullard in his negotiations with the General Electric Company, and he was always ready to help overcome every kind of difficulty. I don't want to detract in any way from the able work of Admiral Bullard. Commander Hooper could not have accomplished what he did without the Admiral's assistance. But the original thought, the initiative and the persistent pushing were Hooper's, and he should have full credit for them." We are therefore publishing the following personality sketch of the naval officer whom Mr. Young esteems so highly, and who has been a valued contributor to this magazine. — THE EDITORS. COMMAN DER Stanford C. Hooper cannot remember the time when communication by means of electricity did not hold a fascination for him. When he was only eight years old, he knew the Morse code. When he was ten he was nosing out more of the secrets of signal strength and dots and dashes. When he was twelve he was an office messenger with an eye and an ear cocked at his main chance at a telegraph key. When he was fourteen he had qualified himself as a telegrapher. Then, with such an education as he had pieced out in San Bernardino while spending his summers work ing independently for the Southern Pacific, substituting for professional telegraphers during their vacations, he made plans to enter the Naval Academy, at Annapolis. Young Mr. Hooper, aged seventeen, with the unusual distinction of having been a telegraph messenger and operator, entered the Naval Academy on September 6, 1901, three years after the Signal Corps successfully demonstrated wireless phenomena for the first time in the United States, and two years after Marconi provided facilities, at the expense of