236 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



objects without the body. Nos. 1 and 2 may be com- 

 bined : No. 3 is not to be combined with either, but 

 used singly ; the No. 4, in the small flat cell, is the higher 

 power, and is to be used with or without the body for ex- 

 tremely minute transparent objects. F, the object-box, 

 which unscrews to place live objects in, such as mites from 

 cheese ; this is placed on the stage. G, a movable piece, to 

 place on the stage, fig. 2, for holding objects. H, slides 

 filled with curious objects. I, a pair of steel-pointed for- 

 ceps, which open by pressing the two brass pins, for hold- 

 ing flies, or pieces of card with opaque objects on them ; 

 this is placed in the hole on the stage or on the arm, when 

 used as a hand microscope, fig. N. K, a dissecting-knife 

 and point ; a pair of brass forceps, for taking up small ob- 

 jects, with a spoon at the end for taking up a single drop of 

 water, for placing between the two glasses to view the ani- 

 malcule ; a small brush for taking the mites from cheese, 

 farina from flowers, and other delicate objects. L, the whole 

 instrument put together for use. N, the arm converted into 

 a hand-microscope. P, two pieces of glass sealed together 

 for holding a drop of water. R, a circular piece of glass 

 for placing on the stage G, to hold any object. 



Directions for putting the Microscope together. First take 

 out the pillar, on which is fixed the stage and reflecting 

 mirror ; screw it on the brass-piece on the side of the box ; 

 turn the mirror to face the light, and move the stage to the 

 centre of the pillar by means of the rack and pinion ; place 

 one of the powers on the body, and screw it into the arm : 

 you must now get a clear and distinct field ; this you will 

 obtain by moving the mirror to the proper angle to reflect 

 the light, at the same time looking through the microscope ; 

 now place the object to be examined on the stage ; get the 

 proper focus of the lens by moving the stage up and down 

 by means of the milled-head, fig. 9. To place the slides in 

 the stage, press down with the fingers the brass spring 

 underneath ; as an improvement for viewing objects gene- 

 rally, the movable piece, G, is placed upon the fixed stage, 

 fig. 2 ; it may be moved by the finger and thumb, with 

 the greatest delicacy, in any direction ; the object to be ex- 

 amined being placed upon the circular piece of glass. 'To 

 place the pillar again in the case, let the stage be brought 

 close up to the arm, and the mirror turned round ; they will 

 then fit into their place without being separated from the 



