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A Simple Form of Portable Microscope, icith Lever 
Adjustment, lohich may be adapted to several different pur- 
poses. By Lionel Beale, M.B., Professor of Physiology 
and General and Morbid Anatomy in King's College, 
London. 
The Microscope which I wish to bring under the notice of 
the Society, seems to me to possess some advantages over 
those in ordinary use in simplicity of construction, in the 
number of uses to which it may be applied, and in price. 
The accompanying outline diagrams show the general ar- 
rangement of the instrument. The telescope stem, «, and 
horizontal arm, 5, upon which the body, c, is fixed by the aid 
of a hinge-joint, e, are made of brass tubes, about an inch in 
diameter. Upon the outside of the stem the stage, jf, and 
mirror, are made to slide. The lower part of the stem 
slides in a tube, provided with a clamp screw, z, so that 
the whole instrument may be arranged in the erect posture at 
any convenient height, Fig. 1, PI. IL If required, the mirror 
can be fixed upon the lowest part of the stem beneath the tripod 
at k. The tripod stand may be made of cast iron or of brass, 
and each leg attached with a hinge-joint, which increases its 
portability. The horizontal bar is prevented from turning 
round by a ridge, which is fixed upon its lower surface, and 
which slides in a groove in a piece of tube attached to the 
upright by a hinge-joint, m. The coarse adjustment consists 
of a knee-lever, tz, and in this way a very smooth and steady 
movement of three inches in extent is obtained. The tube in 
which the body slides should be longer than that in the instru- 
ment exhibited this evening. For the adaptation and manu- 
facture of this lever adjustment I am indebted to Mr. Becker, 
Philosophical Instrument Maker, of Newman-street. A fine 
adjustment may be attached in the usual position, just above 
the object glass, o. Upon the front of the body, in its upper 
part, is placed a small piece of brass, with a number of holes, 
p, in which a small brass pin may be inserted, so that the 
object-glass may be brought as close to the object as may be 
desired, and at the same time without any danger of its being 
forced down upon the object, or through the glass slide 
placed upon the stage. 
Fig. 1 shows the instrument arranged in the erect posture. 
Fig. 2 in a slanting direction. The horizontal arm, 5, in this 
position takes the place of the upright stem. Fig 3 repre- 
sents the microscope arranged for making minute dissections, 
a small pin, r, prevents the horizontal bar from falling too 
vol, IV. c 
