t 3^7 ] 



with the cofine of the large, or fine of the fmall arch. The 

 fubdivifion between ,94 and ,95 includes 1° 44', and therefore 

 from this to the end of the quadrant it will be better to 

 have the fubdivifion'? accurately marked h/ the inftrument- 

 maker, or perhaps better ftill to have a fmall table for this 

 part. 



The annexed figure fliews the divifion propofed ; but only 

 one of the principal divifions is fubdivided. The outer or 

 upper edge of the ring is to be divided in one diredion, and 

 the inner edge in the contrary one. 



A CONSIDERABLE advantage arifes in this method of dividing 

 the compafs from the check which the two readings aiFord. 



