This instrument was first described by Mr. Baker, and recommended by him. It was also described by my father in the fourth edition of his Micrographia Illustrata, page xix.
A B C represents the body of this microscope; it contains an eye-glass at A, a large lens at B, and a magnifier which is screwed on at C, one of which is represented at Q.
The body of the microscope is supported by the arm D E, from which it may be removed at pleasure.
The arm D E is fixed on the sliding bar F, and may be raised or depressed to any height within its limits.
The main pillar a b is fixed in the box b e, and by means of the brass foot d is screwed to the mahogany pedestal X Y, in which is a drawer containing all the apparatus.
O, a milled-headed screw, to tighten the bar F when the adjusting screw c g is used.
p q is the stage or plate which carries the objects; it has a hole at the center n.
G, a concave mirror, that may be turned in any direction, to reflect the light of the candle, or the sky, upon the object.
A LIST OF THE APPARATUS TO CUFF’S DOUBLE-CONSTRUCTED MICROSCOPE.[33]
[33] This microscope is made oftentimes with a joint at the bottom of the main pillar at _e_, to admit placing the instrument into any oblique situation, and connected to the bottom of a mahogany chest; on which account, it is by some of the instrument makers called the Chest Compound Microscope. EDIT.
H, a convex lens, to collect the rays of light from the sun or a candle, and condense them on the object, or to magnify a flower or other large object placed upon the stage.
L, a cylindrical tube, open at each side, with a concave silver speculum screwed to the lower end h.
P, the slider-holder; it consists of a cylindrical tube, in which an inner tube is forced upwards by a spiral spring, it is used to receive an ivory slider K, which is to be slid between the plates h and i. The cylinder P fits the hole n in the stage: the hollow part at k is designed to receive a glass tube N.
R is a brass cone, to be put under the bottom of the cylinder P, to intercept occasionally some of the rays of light.
S, a box containing a concave and a flat glass, between which a small living insect may be confined; it is to be placed over the hole n.