. The Dental cosmos. pastil, pastil. c, Sliding arm. d,Colored celluloid band, e, Colorless pieceof celluloid, f. Holzkneclits scale of units. lowish brown, brown and finally a red-dish brown color. It is obvious, there-fore, that, if one has a standard colorscale, an exposed tablet can be comparedwith it and the reading made in , then, will give an idea of howmuch ray has been administered. The instrument itself may be de-scribed as follows: The only parts thairequire a description are a, b, c, n, e,and f of Fig. 4. a is a half pastil ofthe double cyan hi of barium mount
. The Dental cosmos. pastil, pastil. c, Sliding arm. d,Colored celluloid band, e, Colorless pieceof celluloid, f. Holzkneclits scale of units. lowish brown, brown and finally a red-dish brown color. It is obvious, there-fore, that, if one has a standard colorscale, an exposed tablet can be comparedwith it and the reading made in , then, will give an idea of howmuch ray has been administered. The instrument itself may be de-scribed as follows: The only parts thairequire a description are a, b, c, n, e,and f of Fig. 4. a is a half pastil ofthe double cyan hi of barium mounted on MAC KEK.—MAKING DENTAL RADIOGRAPHS 39 a piece of heavy black cardboard; thismay be designated as the index is the remaining half of the pastilmounted in a similar manner: this wewill call the measuring or reacting pas-til, c is a sliding arm into whichare inserted both a and b. The armslides up and down the instrument,as will be shown later, d is a cellu-loid band or strip about an inch wide. Fig. Holzknecht radiometer with index pastil inposition. which extends from the top to thebottom of the instrument. It is color-less at the top and gradually assumesa reddish brown tint as one progressesdownward. This band is stationary, andthe inner end of the sliding arm c isunder it. e is a small piece of colorlesscelluloid placed on the sliding arm, underwhich the measuring pastil b is is the scale of units generally em-ployed, and known as Holzknecht 5 show? the index pastil a in posi-tion in the sliding arm c and under the celluloid band d. Fig. 6 shows themeasuring pastil b also in nosition onthe sliding arm and under tlx.* piece ofcolorless celluloid e. It might be statedhere that the object of this small piece ofcolorless celluloid, which is always overthe measuring pastil, is to insure thatthe refraction will be the same for boththe index pastil and the measuring pas-til, g (Fig. 6) indicates where the Fig. 6.
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Keywords: ., bookcentury1900, bookdecade1910, bookiddent, booksubjectdentistry
