The Microscope. 197 



G — A moveable piece, to place on the stage, Fig. 2, for hold- 

 ing objects. 



H — Slides filled with curious objects. 



/ — A Pair of Steel-Pointed Forceps, which open by pressing 

 the two brass pins, for holding 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. 



L — The whole instrument put together for use. 



JV — 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. 



7 and 8 — A Dissecting-Knife and Point; a Pair of Brass Forceps, 

 for taking up small objects, with a spoon at the end for taking up 

 a single drop of water, for placing between the two glasses to 

 view the animalcule; a small brush for taking the mites from 

 cheese, farina from flowers, and other deUcate objects. 



Directions for putting the Microscope together. 

 First take out the pillar, on which is fixed the stage and reflect- 

 ing 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 cen- 

 tre 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 hght, at the same time 

 looking through the microscope : now place the object to be ex- 

 amined 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 

 generally, the moveable piece G is placed upon the fixed stage, 

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

 est delicacy, in any direction; the object to be examined 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 pillar. It is more difficult to get the re- 

 flected light with the candle than by day-light, but many of the 

 objects appear to much greater advantage; the candle should be 

 placed at the distance of about twelve inches, not too high, and 

 in a straight line with the mirror. 



Description anp application of the different pow- 

 ers. This microscope has four different powers, so arranged 



