SCIENCE-GOSSIP. 



277 



THE ROSS "ECLIPSE" MICROSCOPE. 



TTOR those beginners or students who find a 

 ■*- microscope indispensible, Messrs. Ross and 

 Co., of 1 1 1, New Bond Street, London, have provided 



piece adjusted to focus on the same plane, which 

 is an important matter. This instrument can be 

 mounted on a tripod foot. The cost is £7 10s. 



Messrs. Ross have designed also a most useful 

 instrument, which they are supplying to South 

 Kensington and many other laboratories both at 

 home and abroad, this is the Petrological Micro- 

 scope, which is attached to the eclipse stand. It 

 is purposely made for students in petrology. The 

 stage is circular, revolving, and the periphery 

 divided to 360 . The eye-piece is furnished with 

 crossed webs and readily drops into a slot. The 

 analyser, which can be drawn out when not needed, 

 is fitted into the lower end of the body tube, where 

 also a slot is cut at an angle of 45 for the insertion 

 of the quartz wedge. The polarizer is pivoted to 

 swing immediately out of the field when so required, 

 and it has a circle divided into 8, clicked at o° and 

 180 , to indicate when the Nicols are crossed. The 

 milled head of the micrometer screw is divided to 

 measure ^^ of an inch motion of the fine adjust- 

 ment. Plane and concave mirrors are provided. 

 There are some other novelties in this instrument, 

 the price of which is /io. No other microscope at 

 this price contains so many useful working parts, 

 nor is more suitable to medical and scientific 

 institutions as well as those working specially at 

 petrology. 



The Ross New " Eclipse " Microscope. 

 (Rigid form.) 



an instrument which, though plain, simple, and 

 low-priced, will be found invaluable to earnest 

 workers. It is in two forms, the one rigid and the 

 other with inclining limb. The points of advantage 

 are combined stability, strength at the working 

 parts, and moderate cost. The foot is ingenious 

 in view of the perfect steadiness required and as 

 allowing the instrument to revolve on its own 

 upright pillar, without liability to flexure. The 

 body tube has the standard screw of the Royal 

 Microscopical Society and carries eye-pieces of the 

 Continental size, and in the simpler instrument is 

 extended by means of a draw-tube to eight inches. 

 The instrument is fitted with one-inch and quarter- 

 inch object-glasses, and compactly placed in box 

 with accessories, the price being £6 5s. 



The second and more generally useful form of 

 the " Eclipse " is one with knee-joint below the stage, 

 which enables the student to place the instrument 

 at any angle, including horizontal for micro- 

 photography. Again the pillar rotates on the 

 base, reversing the instrument on the circular foot. 

 Each form of instrument carries a double nose- 



The Ross New "Eclipse" Microscope. 

 (With Inclining Limb.) 



