or Right Ascension, divided into minutes and the Dedination circle, 

 which has divisions reading as fine as five seconds. Both circles have 

 powerful magnifying lenses, illuminated by small electric bulbs and 

 so mounted that these fine divisions of time — and distance — can be 

 distinctly read by the observer. It has also a photographic attach- 

 ment. 



The accurate and beautiful mounting of the telescope can be 

 easily operated from the eye-end. It is provided with rods and toggle 

 joints leading to clamps and slow motion gears, permitting a close 

 adjustment in both co-ordinates. Within easy reach are the electric 

 switches which control the lights on the circles, those of the room 

 and the red lights during photographic work. 



The magnifying power of this telescope may be changed in a 

 manner similar to that of a microscope, by the use of different eye- 

 pieces. The powers range from 75 to 500 diameters and, when used, 

 they depend upon the objects observed and the condition of the 

 atmosphere. 



Models of Jupiter, the Earth and Saturn. 



The driving clock is located within the steel pier and is driven by 

 a fifty pound weight. It is regulated by a centrifugal governor, and 

 by it the telescope will follow a star during the entire rotation of 

 the Earth. 



Accessories to this telescope include a finder with an unusually 

 large field of view, eight eye-pieces, a diagonal reflecting prism for 

 use when observing objects in the zenith, and two polarizing eye- 

 pieces for gazing directly at the Sun without smoke-glass eye-pieces. 



The Observatory is supplied with many other instruments among 



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