. Quarterly journal of microscopical science. occupied by the stage, /.The slide for transparent objects is circular, and is made ofwood, and has holes bored for the reception of eight piecesof glass on which the object is placed. A piece of thinglass is then put over this, and the whole kept in position byan elastic metallic ring. The slide revolves on a metal LANKESTER, OxN A MUSEUM MICROSCOPE. 237 screw, which is attached to the holder, i, and which occupiesthe place of the stage. By this means eight, ten, or moreobjects may be mounted at the same time, and broughtunder the object-glass by
. Quarterly journal of microscopical science. occupied by the stage, /.The slide for transparent objects is circular, and is made ofwood, and has holes bored for the reception of eight piecesof glass on which the object is placed. A piece of thinglass is then put over this, and the whole kept in position byan elastic metallic ring. The slide revolves on a metal LANKESTER, OxN A MUSEUM MICROSCOPE. 237 screw, which is attached to the holder, i, and which occupiesthe place of the stage. By this means eight, ten, or moreobjects may be mounted at the same time, and broughtunder the object-glass by merely moving the circular compound slide for viewing opaque objects (fig. 2 /)is constructed on a somewhat different plan. It is a frameinto which the common glass slides, three inches by one, canbe pushed, and when it is filled up they are secured by meansof the screws, k. The slides in their frame are then madeto move backwards and forwards in a frame attached to thearm, i, which is situated in the place of the ordinary Fig. 2. Although this slide was made for mounting opaque objectsupon the upright stand, it can be equally applied to trans-parent objects and the oblique stand. Two of these microscopes, constructed by Mr. Ladd,of Chancery Lane, have been at work for some weeksin the Food collection of the South Kensington Museiim,and have excited great interest amongst those who havevisited the Museum. A list of the objects exhibited, asnumbered on the slides, is placed on the table, andevery one seeing the object can thus obtain some know- 238 LANKESTER, ON A MUSEUM MICROSCOPE. ledge of its nature. It lias also heen found necessaryto write out a short label, giving directions how to adjustthe focus of the microscope by the aid of the screw on thetube. Strangers to the instrument do not generally under-stand the way of throwing light on the object from themirror below, and this should be done occasionally by anattendant. When it is known, however, exactly w
Size: 1099px × 2273px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1859
