The microscope and its revelations . greater range ofadaptations; and the particular advantage it possesses, is forthe purpose indicated by its designation. 36. Waringtoiis U?iiversal Microscope.—^A new set ofadaptations for special purposes, called-for by new require-ments, has been recently devised by Mr. Warington; who,by different combinations of the same very simple materials,has produced an instrument which may be used in fourdifferent modes, and which may fairly, therefore, be designatedauniversal microscope. Mr. Wariagtons original objectwas to provide an arrangement, whereby the Compo
The microscope and its revelations . greater range ofadaptations; and the particular advantage it possesses, is forthe purpose indicated by its designation. 36. Waringtoiis U?iiversal Microscope.—^A new set ofadaptations for special purposes, called-for by new require-ments, has been recently devised by Mr. Warington; who,by different combinations of the same very simple materials,has produced an instrument which may be used in fourdifferent modes, and which may fairly, therefore, be designatedauniversal microscope. Mr. Wariagtons original objectwas to provide an arrangement, whereby the CompoundMicroscope should be brought to bear upon living objects inan Aquarium, when these might be either in contact with oneof the glass sides, or be not far removed from it. This heaccomplished by making use of the body of a Students micro-scope _(§ 34), with the grooved limb in which it slides, andattachiiLg the latter by a strong cradle-joint to a tubular stem,which could be fixed at any height upon the edge of the table Fig. Waringtons Universal Mcroscope, as arranged for viewing objectsin an Aquarium. 92 CONSTRUCTION OF THE MICROSCOPE. that supports the Aquarium, by means of a clamp with a bind-ing-screw. Subsequently Mr. W. dispensed with the rack;attaching the cradle-joint at the top of the tubular stem to anouter tube, within which the sliding of the body acts as acoarse adjustment; and providing a fine adjustment (byan ingenious plan of his own) at the object-end of the bodyitself. To the Author, however, it has seemed far more con-venient to retain the rack; and this he has combined with thesliding tube, thus obtaining great facility of adjustment withno perceptible twist; and the arrangement of the apparatus,with tills modification, is shown in Fig. 23. If the rack bewell cut, there will be no occasion for a fine adjustment;since the purposes to which this arrangement is adapted, onlyrequiie low or moderate powers. When the instrument is setup in the above posit
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