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



simple in its construction, and easier to manage ; and even 

 when combined with the improved phantasmagoria lantern, 

 is less expensive than the commonest solar microscope. 

 Objects may be magnified by this microscope from a few 

 inches to eight or nine feet diameter, or even more, but most 

 objects appear best when magnified from three to six feet. 

 The screen, if there is no white wall, should be made of 

 large drawing-paper, strained tight on a frame. The screen 

 used for the phantasmagoria, or a window blind, will answer, 

 but not so well as one made of paper, many of the finei 

 parts being rendered indistinct by the irregularities of the 

 surface, and also from much of the light passing through 

 the screen instead of being reflected from it. By the addi- 

 tion of a plane mirror, fig. 3, plate 735, set in a brass frame, 

 which screws on tlie magnifier tube, objects may be thrown 

 on a sheet of paper placed either on the floor or on the 

 table, or they may be reflected up to the ceiling. 



To use tlie Lucernal Microscope. (Fig. 735.) It is repre- 

 sented in the plate attached to the improved phantasmagoria 

 lantern, in which way it is generally made, though it may 

 be constructed to act as. a microscope only. Unscrew the 

 brass plate which fills up the hole in the back part of the 

 lantern, and screw the microscope, fig. 2, in its place; see 

 fig. 1. Having made the lamp burn brilliantly, and the 

 lantern being placed on a table about four or five feet from, 

 and directly opposite the screen, push in one of the sliders 

 with objects, fig. 4, between the spring plates, and adjust 

 the magnifiers to the focus, by turning round the tube in 

 which they are fixed. 



It is hardly necessary to remind the operator that the 

 lenses should be perfectly clean, and the room as dark as 

 possible, as upon these circumstances in a great measure 

 depends the perfection of the image. If you wish to make 

 a drawing of the image, place the lantern on a high stool 

 upon the table, and screw the frame, tig. 3, into the front 

 part of the microscope, by turning it round so that the 

 mirror be below ; the image will be represented in a very 

 beautiful manner on a sheet of paper placed on the table to 

 receive it, and an accurate outline may be taken of it, even 

 by those unaccustomed to the use of the pencil. By bring- 

 ing the tube of the microscope beyond the edge of the table, 

 the image may be reflected on the floor, and by turning it 



