The microscope and its revelations . t; the latter being fixed into the transversearm. The mode in which the object is supported upon thestage, when this is inclined, is very simple and ingenious, andis in some respects preferable to the sliding-ledge generallyused by English makers. Near each side of the stage is seena somewhat elastic strip or tongue of sheet-brass, the frontextremity of which is fr^ee, but which is attached at its hinderend to a pin that passes through a hole in the stage, in whichit works very easily. This pin is prolonged for about f-inch * The cost of this mstmment essen
The microscope and its revelations . t; the latter being fixed into the transversearm. The mode in which the object is supported upon thestage, when this is inclined, is very simple and ingenious, andis in some respects preferable to the sliding-ledge generallyused by English makers. Near each side of the stage is seena somewhat elastic strip or tongue of sheet-brass, the frontextremity of which is fr^ee, but which is attached at its hinderend to a pin that passes through a hole in the stage, in whichit works very easily. This pin is prolonged for about f-inch * The cost of this mstmment essentially depends upon the number andmagnifying power of the objectives supplied with it; it is usually provided,however, with a 1-inch and |-inch; and is then sold (without the rack-move-ment) at £6 10s. This sum, however, does not include either a case or anyaccessory apparatus. nachets microscope. 85 beneath, the stage, and then terminates in a broad flat head;and it is surrounded by a slender spiral spring, which, bearing Fig. Nachets Compound Microscope, at its two ends against the under side of the stage and thehead of the pin, tends to depress the latter, and thus to bringthe brass tongue into close apposition with the stage whennothing intervenes, and to bind-down anything that may beplaced between them. Li making use of this little apparatus,it is most convenient to employ both hands, in such a manner 86 CONSTHUCTION OF THE MICROSCOPE. that tlie thumb and fore-finger of each shall hold one end ofthe slip of glass whereon is placed the object under examina-tion, whilst one of the other fingers of each hand is usedto push-up the head at the end of the pin, so as to lift thetongue from the stage; the slip of glass can then be movedfrom side to side, or up and down, with the most perfectfreedom, and may be firmly secured at any point by ceasing topress upon the heads of the pins, which ^vlll then be forced-down by the springs, so as to bring the tongues to bear onthe sl
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
