J. R. Dunning

Regulator Systems for Electromagnets

A regulator for maintaining constant, to better than 0.1 percent over long periods, the magnetic field of large (100 kw) electromagnets is described. This consists of two basic components: (1) A vacuum tube voltage regulator which compensates for rapid changes in voltage and thus anticipates the change in current which would result. (2) A current actuated element arranged so as to alter the operating point of the voltage regulator in order to compensate for slow changes in current due to changes in the temperature of the windings. Very rapid regulator action is secured with no drift or hunting to the limit specified.

Do scientists and engineers need each other

Historically, man has been a curious animal, and this has spurred his progress. He has searched for the invisible and has probed for the unknown; he has groped for the inaccessible and has struggled for the unattainable. He has disobeyed every injunction that he not eat the fruit of the tree of knowledge. But he has accepted the great challenge that if you know the truth, “the truth shall make you free.” The fruit of the tree of knowledge has been sweet, and it has been bitter. If knowledge and truth shattered the dream of some placid Eden, man has been content to labor outside the gates. And today, even though the prospect may sometimes be awesome, he is using all the keys of his genius to unlock the doors that hide Natures secrets.

Metaborate Compounds for Internal Cyclotron Targets

The use of NaBO2 as a target material for the preparation of radioactive Na24 through the deuteron bombardment reaction 11Na23+1d2→11Na24+1p1 is discussed. The general advantages of NaBO2 as a target material, compared to metallic sodium or other sodium containing compounds, are given, as well as the procedure for target preparation and the details of the chemical treatment used for the purification of the Na24.The general use of metaborate targets is discussed briefly for other deuteron bombardment reactions in which an elementary target material is less practical to use.