ARRANGEMENT FOR INCLINING THE INSTRUMENT. 
23 
CHAPTER IL 
MECHANICAL PORTION OF THE MICROSCOPE. 
38. Modern lmprovemeiit§ in the optical portion of the 
microscope have rendered necessary corresponding improve- 
ments in the mechanical arrangement and support of the 
several parts, in order to secure facility of manipulation and 
freedom from tremor, or vibration, which might disturb the 
steadiness of distinct observation. 
The microscope stands or mechanical portion^ consists of the 
base or foot, the stage, and compound body with its support, 
including the mechanical arrangements for effecting the requi- 
site adjustment of all the parts. 
39. Base. “The instrument (says Dr. Beale) should stand 
firmly, whether the body be inclined or arranged in a vertical 
position, and not the slightest lateral movement should be com- 
municated to the body of the microscope, when the focus is 
altered by turning the adjustment screws. The base should 
be sufficiently heavy to give steadiness, and should be made 
either of a tripod form, or placed upon three small feet, (a 
simple means of insuring steadiness not attended to in many 
of the foreign instruments.)” 
40. Arrangement for Inclining the Instrument. The 
instrument ought to be provided with an arrangement by which 
it may be placed in a horizontal position, or inclined at any an- 
gle, for the convenience of drawing with the camera, or meas- 
uring objects with the aid of that instrument, or to give an 
easy position to the observer. When the eye looks directly 
downwards into the microscope, the fluids collecting on the 
CATALOGUE OF ACHROMATIC MICROSCOPES. 
