Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . e end of which the nephelometer fits snugly. Apartition extending part way up the box as shown in the diagram(Fig. 84) serves the double purpose of shutting off the light fromthe lower part of the instrument and of providing a stop againstwhich the instrument is pushed, so that its distance from the light BLOOD ANALYSIS 293 is kept constant. The box is conveniently made without a bottomand the end closed with a dark curtain after the nephelometer is
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . e end of which the nephelometer fits snugly. Apartition extending part way up the box as shown in the diagram(Fig. 84) serves the double purpose of shutting off the light fromthe lower part of the instrument and of providing a stop againstwhich the instrument is pushed, so that its distance from the light BLOOD ANALYSIS 293 is kept constant. The box is conveniently made without a bottomand the end closed with a dark curtain after the nephelometer ispushed into place. The inside of the box should be painted dark room is desirable but not necessary, as the instrument maybe used satisfactorily in a room darkened by a dark shade or even in adark corner of the laboratory. The relations of the nephelometer and the light source may beseen in the diagram, Fig. 84. The lamp used is an ordinary 50-watt tungsten (Mazda) supported by a bracket about 30 cm. fromthe nephelometer and at the height of the nephelometer tubes. Thechange from one instrument to the other can be made in one or two. Fig. 85.—Lenzmaxn-Kober Nephelometer. minutes, since it consists essentially only in unscrewing the brassplate carrying the plungers and screwing on the plate to carry thenephelometer tubes. The extra parts needed, plate, tubes, andjackets, are few and can be made if necessary from material at handin any laboratory and by anyone with a sUght degree of The above description applies t)nly to the later type of colorime-ter where the cups move and the prisms are stationary. The changesrequired to convert the older type of instrument are more complicatedand scarcely to be advised unless the instrument is to have fairly * The extra parts necessary for the conversion of the colorimeter into the nephelometermay be obtained from the International Instrument Co. of Cambridge, Mass. 294 PHYSIOLOGICAL CHEMISTRY continuous use as a n
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
