346 HOW TO SEE WITH THE MICROSCOPE. 



The base is of the tripod form, neatly japanned ; pillar and 

 arm of brass, connected by a solid joint, which allows inclina- 

 tion of body to any angle ; rack and pinion for coarse adjust- 

 ment, tine adjustment by our patent frictionless motion ; main 

 tube with two draw tubes. This is an entirely new feature in 

 microscopes, which is an unquestionable improvement. It per- 

 mits the use of standard length of tube for quick adjustment 

 in outside tube, same as in instruments without rack and pinion 

 adjustment ; the same for any low power objective and the use 

 of amplifier in either combination. The outside tube has a 

 broad gauged screw, and adapter with society screw. The stage 

 lies in the same plane as center of movement for mirror, is of 

 brass, and has concentric, revolving motion with removable 

 clips. It is thin to allow great obliquty, and as it rests upon a 

 strong projecting arm, is perfectly firm under any manipulation. 



The mirror bar swings with a peri'ectly easy but firm motion, 

 upon one bearing to any obliquity below, and above the stage 

 for the illumination of opaque objects, and has affixed to it a 

 secondary bar, to which the mirror is attached and which allows 

 the separate use of the latter in any position of the sub-stage. 

 It is provided with a sliding arrangement, whereby the mirror 

 may be moved to and from the object. The mirrors are plain 

 and concave, and of large size. The substage is adjustable 

 along the mirror bar, and entire removable. It contains a 

 diaphragm which may be brought directly under the stage. The 

 ring is of standard size and is easily centered by a set screw. 

 The stand is furnished with an eye piece of any power. 



In black walnut case, with receptacles for eye pieces and 

 objectives, drawer for accessories, handle and lock, price $40.00. 



Same, with C Eye Piece, arranged for micrometer, camera, 

 lucida, micrometer, 3-4 inch and 1-5 inch objectives, $65.00. 



BAUSCH & LOME OBJECTIVES. 



Deg. Price. 



2inch 18 $12 00 . 



2inch 12 600 



linen 36 2000 



linch 20 600 



