A New Type of Electromagnet. Part I. Operation at 20-kw Level

An improved iron core magnet for general laboratory use, weighing two tons, has been designed and several units have been constructed. The design incorporates the desirable features of a number of earlier magnets and is engineered to give the optimum utility with minimum space and weight and with minimum attention by the operating personnel. A summary of test performance at 20 kw is given below. Operation at higher power levels will be described in Part II. $$\begin{array}{cc}\text{11−}\mathrm{in.\; diameter\; poles}& \\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}5−}\mathrm{in.\; gap}& \text{10\hspace{0.17em}}\mathrm{kilogauss}\\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}2−}\mathrm{in.\; gap}& \text{17\hspace{0.17em}}\mathrm{kilogauss}.\\ 5\frac{3}{4}-\mathrm{in.\; diameter\; poles}& \\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}2−}\mathrm{in.\; gap}& \text{23\hspace{0.17em}}\mathrm{kilogauss}\\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}1−}\mathrm{in.\; gap}& \text{30\hspace{0.17em}}\mathrm{kilogauss}.\\ \text{1−}\mathrm{in.\; diameter\; poles}& \\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}1−}\mathrm{in.\; gap}& \text{32\hspace{0.17em}}\mathrm{kilogauss}\\ \mathrm{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\frac{1}{2}-\mathrm{in.\; gap}& \text{37\hspace{0.17em}}\mathrm{kilogauss}\\ \mathrm{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\frac{1}{4}-\mathrm{in.\; gap}& \text{42\hspace{0.17em}}\mathrm{kilogauss}.\end{array}$$