108 



Scientific Proceeding*. Royal Dublin Society. 



is turned : and, consequently, the point of the screw does not sen- 

 sibly vary in its position with respect to the clamp-arm EFGr. A 



JD 



Fig. 1. 



short stiff spring can therefore be used, and the disadvantage above- 

 mentioned disappears. 



Xew Position Finder. — The inconvenience of having to rise 

 from the observing-chair to read the Eight Ascension and Declina- 

 tion circles of an Equatorial has tempted opticians to devise many 

 contrivances by which the circles may be read from eye-end of tele- 



Fig. 2. 



scope. In some cases the following piece of apparatus will probably 

 be found useful. It can be attached at any convenient position 

 near eye-end of telescope. It (fig. 2) consists of a circular level 



