. A text-book of radiology . f this withhis coils, and it should always be obtained beforepurchasing one. To describe even a small proportion of the outfits avail-able would take far too much space without any com-mensurate advantage; so only one or two, typical of thewhole class, will be noticed. Supposing we want a coil outfit for general purposesihat could be used either in the physicians consulting 68 TEXT-BOOK OF RADIOLOGY. room or at the patients house. Probably no better existsthan the one I had made for my own use by Newton & Co. It consists of three boxes and the nickel-plated tubewhi
. A text-book of radiology . f this withhis coils, and it should always be obtained beforepurchasing one. To describe even a small proportion of the outfits avail-able would take far too much space without any com-mensurate advantage; so only one or two, typical of thewhole class, will be noticed. Supposing we want a coil outfit for general purposesihat could be used either in the physicians consulting 68 TEXT-BOOK OF RADIOLOGY. room or at the patients house. Probably no better existsthan the one I had made for my own use by Newton & Co. It consists of three boxes and the nickel-plated tubewhich forms the upright of the holder for the X-ray tube. In the smallest box is a 24-volt accumulator. The cellsare of 30 ampere-hour capacity, and will be found quitelarge enough to meet any ordinary demand. The next larger box contains the 10-inch coil,interrupter, condenser, regulating resistance reversing-switch, and terminals for attaching the wires from thebattery. The largest box contains two X-ray tubes, screen and. Fig. 27. Portable X-ray Outfit, packed for transport. fluoroscope, lead-lined cell for X-ray plates up to 12 x10;/, and all the accessories. This outfit can easily be transported to any distance,and is capable of dealing with any work likely to becalled for, but it will not do for rapid or instantaneousexposures of the thicker parts of the body. If, on the other hand, it is desired to have somethingmore powerful and portability does not come into thequestion, then a larger coil capable of giving 15-inch oreven 18-inch sparks will be advisable. Though we seldom have our tubes harder than a 6-inchequivalent spark-gap, and more often from 3-inch to4-inch, it is a fact that the larger the coil within certainlimits, the better are the final results. Moreover, a tubewhich seems to be too hard on an 8-inch coil works quite INDUCTION COILS. 69 smoothly on a 15-inch or 18-inch coil, and in fact, care-fully used, the life of a tube is greater with a big coilthan with a
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