. A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice . Plate 3.—Positive Phase of Electric Energy. Action upon the film of a single
. A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice . Plate 3.—Positive Phase of Electric Energy. Action upon the film of a single positivespray discharge from a high potential coil. This fern-like picture of a power in scientificmedicine vs^hich the profession is only just avs^akening to study, but which it has happily be-come a badge of ignorance to deprecate, is reduced from a magnificent photograph 18 by 23inches in size. It therefore does faint justice to the beautiful original. It is one of a remark-able series of fifty photographs of different electrical discharges, all 18 by 22 inches, made byMr. Kinraide, of Boston, in experiments with the Kinraide coil. Having seen them all, theauthor has the greatest regret that it is impossible to present them here in unreduced impres-siveness. Without question they furnish the most striking, unique, and magnificent recordof electrical discharges ever made. They would have astonished Faraday beyond Plate 4.—These plates illustrate the brush discharge from a sixteen-inch coil with theWehnelt electrolytic interrupter. Note the difference between the fat stream and the ordinaryspark of mechanical breaks. The parallel scale shows the great reduction from the original. STUDIES m X-EAY MECHANICS 33 break tlian lias been our experience, for one authority, in stronglyrecommending the use of the Wehnelt, lays stress upon its qualityof being practically permanent in wo7-king, and requiring no atten-tion and no cleaning or repairs for years, so that it may be
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Keywords: ., bookcentury1900, bookdecade1900, bookidsystemofinst, bookyear1902
