. Practical radiography : a handbook for physicians, surgeons, and other users of X-rays . Fig. 19. from the disqualifying peculiarity of carbonizing after use. Fig. 20 shows the arrangement of such a coil; theprimary is similar in all respects to that of an ordinaryinduction coil. The secondary, however, consists of asingle bobbin of fine wire, weighing about lj lbs. only,which is placed midway on the primary, and supported bya block of wood (by means of two glass tubes, h); thewhole is enclosed in a glass cylinder and filled with the Induction Coils and Interrupters 57 special insulating pas
. Practical radiography : a handbook for physicians, surgeons, and other users of X-rays . Fig. 19. from the disqualifying peculiarity of carbonizing after use. Fig. 20 shows the arrangement of such a coil; theprimary is similar in all respects to that of an ordinaryinduction coil. The secondary, however, consists of asingle bobbin of fine wire, weighing about lj lbs. only,which is placed midway on the primary, and supported bya block of wood (by means of two glass tubes, h); thewhole is enclosed in a glass cylinder and filled with the Induction Coils and Interrupters 57 special insulating paste. Owing to the small resistance £>fthe secondary, this coil gives very fat sparks, whichwould materially aid in obtaining short exposures, butfor some reason or other the instrument has come littleinto use, especially since some of the new interruptershave enabled us to attain high efficiency with Fig. 20. Closed Magnetic Circuit Coil.—This latest type oftransformer aims at higher efficiency by producing from agiven primary current a more powerful magnetic field, agreater inductive effect being obtainable thereby withoutthe necessity of employing an immense number of fine wireturns in the secondary. This is effected by carrying themagnetic lines of force for practically the whole of theirpath through soft iron instead of providing—as at present 58 Practical Radiography —only a small length of iron and completing the magneticcircuit through air (a bad magnetic conductor). Owing tothe reduction in the resistance of the secondary circuit thequantity therein generated is very greatly in excess
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectxrays, bookyear1901
