766 SEC. 18. BIOLOGY. 



3546. " University Student's Microscope," in a cheap 

 and efficient form, especially designed for medical and botanical 

 students. James Swift. 



3547. Crane Arm Binocular Microscope, with newly 

 contrived concentric stage and adjustable object holder moving 

 upon glass bearings. James Swift. 



3548. Student's Microscope in an alloy of German silver 

 and aluminium. James Swift. 



3549. Microscope. Crisp, London. 



3550. Microscopes. G. S. Wood, Liverpool. 



3551. Microscope with complex adjustments, searcher, and 

 oblique condenser apparatus. Dr. Royston-Pigott, F.R.S. 



This microscope is fitted with a peculiar hypocycloidal movement and tra- 

 versing screws for very delicate observations. The condenser possesses wide 

 rectangular movements combined with a unique oscillating oblique action for 

 directing the minute image of a flame or the sun either directly or obliquely 

 upon any desired point in the field of view, giving fine views of many difficult 

 objects, and gorgeous diffraction phenomena with circular solar spectra. It 

 is also fitted with Dr. Royston-Pigott's searcher for aplanatic images, by 

 which much greater depth of focus is attained, and new powers of correcting 

 chromatic and spherical aberration, by moving the searcher between the 

 objective and the eye piece or ocular. 



3552. Improved Microscope, with rotating body. 



John Browning. 



This instrument is contrived so as to combine the advantages of the English 

 with the continental models ; it is especially adapted for dissecting purposes, 

 as the body rotates with the stage ; objects may be examined with any power 

 without losing their centricity. 



3553. Stephenson's Binocular Microscope. 



John Browning. 



In this instrument, for the first time, the planes introduced by Mr. Ste- 

 phenson for altering the direction of the ray, so that the microscope can be 

 used with the stage in a horizontal position, have been introduced near the 

 eye-piece in the separate bodies ; this arrangement will, it is believed, be found 

 to possess considerable advantages. With Stephenson's binocular, objects 

 may be examined with both eyes with the highest objectives. 



3554. Microscope with Micro-Spectroscope. 



John Browning. 



The micro-spectroscope, is intended for the observation of absorption bands 

 in the spectra of solids or fluids, either by reflected or transmitted light. The 

 instrument exhibited contains Mr. Sorby's most recent improvements. 



3555. Pocket or Field Microscope, with two achromatic 

 object glasses, contained in a leather case, measuring 7 x 3 x 1| in. 



John Browning. 



