CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



343 



No. F585. 



No. 8610. 



No. F586. 



F584. MICROSCOPE, Measuring, Mounted. A plain microscope without micrometer. Fitted with fixed 

 cross hairs, tube and clamp collar. Diameter of tube, 22 mm. Magnification, about 30 diameters. 



Complete with No. F591 Support 25.50 



F585. MICROSCOPE, Measuring. Same as No. F584, without support 13.50 



F586. MICROSCOPE, Measuring, Mounted. Similar to No. F584, but with eyepiece micrometer. This 

 micrometer is of new design and is guaranteed to be of the highest order of workmanship and 

 accuracy. The pitch of the micrometer screw is 0.25 mm, and its range is 10 mm; since the 

 micrometer head is divided into 100 parts it is possible to read to 0.0025 mm at the cross hairs. 

 Since the magnification of the objective is about 3 diameters this is equivalent to a reading of 

 about 0.0008 mm on the object being measured. Total magnification, about 30 diameters. Com- 

 plete with No. F591 Support 45.00 



F587. MICROSCOPE, Measuring. Same as No. F586, without support 33.00 



F591. MICROSCOPE SUPPORT. A heavy, adjustable support for measuring microscopes. The micro- 

 scope can be held rigidly in any position, as all joints can be tightly clamped. The base is 

 sufficiently heavy to insure the stability required in a microscope used for accurate measure- 

 ments. The top of the base is machined, so as to enable the attaching of stages or other acces- 

 sories. The diameter of the horizontal and vertical arms is the same and the microscope may 

 be clamped in a horizontal position, so as to read a vertical scale. Vertical range about 9 cm; 

 horizontal range about 12 cm. Illustration shows Microscope No. F587 used in connection with 



the support. Support only, without microscope 12.00 



MICROSCOPES, Metallurgical, see Metallurgical Apparatus. 

 MICROSCOPES, Projection, see Catalog F of Physical Apparatus. 



MICROSCOPE ACCESSORIES 



(Alphabetically Arranged.) 



8610. ABBE SUBSTAGE CONDENSER. In order to secure the best results with objectives of high 

 power, an Abbe Condenser must be used. The condenser illustrated has an aperture N. A. 

 1.20 and meets all the requirements of practical work. It is fitted with an iris diaphragm 

 beneath to modify the amount of light, and is also provided with a ring beneath the iris to hold 

 a blue glass for cutting out the yellow rays of artificial light; or to hold a center stop which to 

 some extent will provide dark field illumination. The mounting is like the cut for the friction 

 collar substages or is swung on the arm of the down-swing condenser mounting 9.00 



8614. CAMERA LUCID A, Abbe's, designed to satisfy the demands of the serious laboratory worker. 

 It has a very large mirror, 70 mm x 105 mm, which is supported on adjustable, graduated 

 mirror bar. " Its unique, compact mounting makes it possible to place the eye sufficiently 

 close to the prism so that the pupil takes in all of the divergent rays coming from the whole 

 of the field of the ocular, making the field appear as large and the object very nearly as 

 distinct as when viewed without the camera. The prism is so mounted that the opening in 

 the silvering can be lowered in the case of the higher power oculars, or raised with the lower 

 powers until it comes to the exact focus of the ocular. The prism can be so centered by 



