1884.] 



MICROSCOPICAL JOURNAL. 



65 



(fig. 14) having three straight slots 

 to receive the lugs be- 

 fore mentioned, and 

 an outer tube or ring 

 free to revolve through 

 a limited arc around 

 the inner tube, but 

 prevented from slip- 

 FiG. H- ping up or down, and 



having three L-shaped slots. When 

 this ring (fig. 15) is turned so that 

 its slots coincide with 

 those of the inner 

 tube, the objective 

 can be easily slipped 

 up to its place. A 

 very slight turn of the 

 Fig. IS. milled ring then 



brings the horizontal portion of its 

 slots under 

 the pins of 

 the objec- 

 tive, and 

 clamps it 

 a c c u rately 

 and secui-e- 

 ly. The use 

 of the ad- 

 justment collar 

 or any accident- 

 al touch of the 

 objective will not 

 loosen it or disturb 

 it in the slightest 

 degree, while it per- 

 mits of the substitu 

 tion, on the instant, of 

 any other objective in 

 one's whole equipment 

 as easily as the double nose- 

 piece permits^^of the ex- 

 change of one other only. 

 The objectives not in use 

 lie in their places in the 

 case or drawer'out of 

 the way and out of 

 danger of injury, in- 

 stead of projecting 

 out over the stage, a 

 hindrance to the ma- 

 nipulation of the lens 

 in use, and liable to 

 accident in many 

 ways. 



' It will be seen that the device can 

 easily be used with the stands and 

 objectives now on hand, the nose- 

 piece being made with the society 

 screw, and separate rings provided 

 for each objective. Its fullest advan- 

 tages will be realized, however, when 

 the society screw has been discarded 

 entirely, and stands are made with 

 this nose-piece after this design, and 

 objectives having the three pins in 

 place of the society screw, and having 

 a diameter of say ^ inch or i inch, 

 as may be agreed" upon. This would 

 then permit the objective to be 

 brought close up to the binocular 

 prism which is not possible with any 

 form of nose-piece now in use except 

 the ingenious device of Mr. Nelson, 

 while it could have much the advan- 

 tage of his plan in security.' 



A New Form of Stand. 



The stand illustrated in fig. 16 is 

 constructed by the Bausch & Lomb 

 Optical Company, and de- 

 signed by the Hon. J. D. Cox, 

 F. R. M. S. It possesses 

 some features which 

 recommend it to the 

 microscopist, such as 

 great stability 

 in all positions, 

 and am- 



FiG. 16. — Bausch & Lomb's New Microscope. 



