OF OPTICAL INSTRUMENTS. 107 



1132. An improved adaptation of analysing prism to the above renders it really the 



best microscope (at moderate cost) in use, extra . . 150 



N.B. The advantages of this arrangement are effectual illumination in both bodies, the 

 analyser being placed above the binocular prism, the transmission of a greater amount of 

 light without the distortion, consequent upon a reduction of the distance between the objec- 

 tive and binocular prism. 



1133. Large Microscope, with crane-formed arm, with sufficient bar motion for 



the 4-inch, objective, improved compound stage, with f-inch motion in 

 rectangular directions, rotating plate and object-holder, improved lever fine 

 adjustment with divided milled head, as No. 1107, jointed arm to mirror, 

 2 eye-peices, A and B, stand condenser, live box, dipping tubes in case, stage 

 forceps and pliers, in mahogany case, complete . . 18 



1134. WENHAM'S BINOCULAE AEEANGEMENT to 'this stand, instead of the above 



monocular form, with l^-inch. rack and pinion motion to draw tubes, and 2 

 extra eye-pieces, A and B, extra . . . . 500 



1135. ImprOYed Binocular Microscope, as used by the Royal Microscopic Society 



of London. The stand of this instrument is highly approved by the best 

 authorities, and has sufficient bar motion to work with the 4-inch, objective, with 

 rotating object plate and clamp, mechanical stage, with f-inch motions in rectan- 

 gular directions, lever fine adjustment, Wenham's binocular arrangement, with 

 li-inch. rack and pinion motions to draw tubes, jointed arm to mirrors, and 

 pair of eye-pieces, A or B (fig. 1135), p. 106 . 12 



1137. If in polished mahogany case, extra ... 120 



1 138. The above instrument of monocular construction with mirrors and 2 eye-pieces, 



AandB . . . . . . 990 



1139. SUPEEIOE Six GUINEA MONOCULAB MICEOSCOPE, consisting of improved brass 



stand, with extended bar motion to work with 4-inch, objective, lever 

 fine adjustment, sliding or spring stage, with revolving diaphragm of aper- 

 tures, plain and concave mirrors, on jointed arm, and one eye-piece, A or B 

 (fig. 1139), p. 106 . . . . . . 600 



1140. If in polished mahogany case, extra . . . . 15 6 

 1142. The Student's Improved Binocular Microscope, similar to the preceding, ^ 



with fine adjustment for high powers, improved lifter motion to draw tubes,* 

 for adjusting to the width of the eyes, sliding stage mirrors and pair of 

 eye-pieces, A or B (fig. 1142), p. 108 . . . 660 



1143. The spring stage (fig. 2), p. 108, can be adapted to the above at an extra cost of 



066 



This instrument forms an excellent basis for a compound stand, the lever stage or the 

 ordinary compound rack and screw stage, can be readily adapted to it; it is also provided with 

 tu be fitting to receive all requisite accessory apparatus ; the following is very suitable for this 

 instrument : 



1144. Polarizing Apparatus 180 



1145. PAEABOLA. . . . . . . . 18 



1146. SPOT LENS . . . . . . . 090 



1147. STAGE FOECEPS . . . . . . 036 



1148. LIVE CAGE . .... 036 



1149. DOUBLE NOSEPIECE 12 6 



