Clinical lectures on the principles and practice of medicine . urposes of the anato-mist and physiologist, as well as affordyou every possible assistance in theway of diagnosis as medical men. Forthis purpose, you should learn to dis-tinguish what is necessary from whatis unnecessary, in order that you mayprocure the former in as convenienta form, and at as moderate a cost aspossible. A microscope may be divided intomechanical and optical parts. Theformer determine its general form andappearance. Of the numerous modelswhich have been invented, the onehere figured, exactly one-fourth its realsi
Clinical lectures on the principles and practice of medicine . urposes of the anato-mist and physiologist, as well as affordyou every possible assistance in theway of diagnosis as medical men. Forthis purpose, you should learn to dis-tinguish what is necessary from whatis unnecessary, in order that you mayprocure the former in as convenienta form, and at as moderate a cost aspossible. A microscope may be divided intomechanical and optical parts. Theformer determine its general form andappearance. Of the numerous modelswhich have been invented, the onehere figured, exactly one-fourth its realsize, appears to me the most useful forall the purposes of the physiologistand medical practitioner. The bodyconsists of a telescope tube, eightinches in length, held by a split tube, thr„e inches long. It may be Fig. 46. Oberhaeusers model, made at my suggestion for medical men, l-4th thereal size. This instrument may be procured at M. manufactory, Place Dau-phine, Paris, or at Mr. Youngs, cutler, North Bridge, and Mr. Kemps, InfirmaryStreet, Fig. 46. 78 EXAMINATION OF THE PATIENT. elevated and depressed with great readiness by a cork-screw movement,communicated to it by the hand, and this constitutes the coarse adjust-ment. It is attached to a cross-bar and pillar, at the lower portion ofwhich last, very conveniently placed for the hand of the observer, is thefine adjustment. The stage is three inches broad, and two and a halfinches deep, strong and solid, with a circular diaphragm below it. Thebase of the instrument is heavily loaded with lead to give it the neces-sary steadiness. This form of microscope possesses all the mechanical qualities re-quired in such an instrument. These are—1st Steadiness; 2d, Powerof easy adjustment; 3d, Facility for observation and demonstration;and, 4th, Portability. 1. Steadiness.—It must be evident that if the stage of the microscopeis subject to any sensible vibration, minute objects, when magnifiedhighly, so far from bei
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmedicine, bookyear187
