446 



SUPPLEMENT. 



linder : and, at the same time, it will shew in what sign 

 of the ecliptic the sun then is, and you may very nearly 

 guess at the degree of the sign, by estimation of the 

 eye. 



When a level table cannot be had, the dial may be 

 hung by the ring F at the top. And when it is not 

 used, the wire that serves for a stile may be drawn out. 

 and put up within the cylinder ; and the machine carried 

 in the pocket. 



To make three Sun-dials upon three different Planes, so 

 that they may all shew the Time of the Day by one 

 Gnomon. 



On the flat board A B C, describe a horizontal dial, 



according to any of the rules laid down in the Lecture 



