. 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 . he opposite corners of theplate. Tlie intersection of this X will correspond
. 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 . he opposite corners of theplate. Tlie intersection of this X will correspond with the centre ofthe film and the exact axis of the central rays, for it will be the posi-tion denoted by the rod of the Finder which locates the axis. Ifspecial marking of the diagnostic field on the negative is desired sim-ply fasten a ring of fine copper-wire on the skin of the patient withstrips of adhesive plaster, and when the negative is finished it willbe marked with the same ring. It is also obvious that this method of centering the diagnosticfield always indicates to the operator the essential part of the nega-tive to study for diagnosis. This is especially useful when a largenegative is made. In addition to rendering the above services theheavy and rigid metallic base of the Position-Finder gives a firmunbending support to a glass plate, preventing breakage under aheavy body. It also hachs the plate with a dense protective which isopaque both to direct and secondary X-rays; thus sharpening defini-. Plate 58.—Authors Position Finder. Ready method of centring plate with focus oftube, as taught in the text. Operator is sighting down anode and along rod to base. Thelines on the base show different sizes of photographic plates, each of which has a centred holefor the rod. Shift the base with the hands till the focus is sighted, then remove the rod andlay the plate on the base film side up. Then place the part to be radiographed on the platewith its marked centre on the
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Keywords: ., bookcentury1900, bookdecade1900, bookidsystemofinst, bookyear1902
