VOL. XXVII.] PHILOSOPHICAL TRANSACTIONS. 7O7 



Account of the Experiment on the Ascent of Water between two Glass Planes, in 

 an Hyperbolic Figure. By Mr. Francis Hauksbee, F.R.S. N° 336, p. 539. 



I took two glass planes, each somewhat more than 20 inches long, of the 

 truest surfaces I could procure. These being held close together at one of their 

 ends, the other ends were opened exactly to an angle of 20 minutes. In this 

 form they were edgewise put into a trough of tinged water, which immediately 

 rose between them in the form of fig. 12, pi. 17^ At another time the planes 

 were opened to an angle of 40 minutes: then the water appeared between 

 them, as in the scheme, fig. 11. By these schemes the proportions of the 

 power of attraction are in some measure evident to the eye; for there may be 

 seen at the several distances, how many lines, which are I2ths of inches, the 

 water is elevated, and the prodigious increase of them near the touching ends. 

 I hope the tables are pretty accurate; for after many trials, I find the successes 

 to be much the same, according to the different angles. This experiment was , 

 first made by Mr. Brook Taylor, as appears by his letter above. 



A Table according to the Scheme of the Planes A Table according to the Scheme of the Planes 



opened to an Angle of 4:0 minutes, infg. 11. opened to an Angle of 20 minutes, infg. 12. 



Distances in Inches and Parts of Number of Lines elevated Distances in Inches and Parts of Number of Lines elevated 

 Inchesfrom the touching Ends. at the several Distances. Inches from the touching Ends, at the several Distances. 



9 1 13 1 



6 2 9 2 



4| 3 7 3 



3 4» 6 3| 



2| 6 5 5 



2 7i 4 6| 



H 10 3 9 



1^ 12 24^ 12 



1 15 2 154 



Oi 19 1| 18 



0^ 28 1| 214 



0^ 50 H 27i 



1 35 



0| 50 



0| 76 



A Description of the several Strata of Earth, Stone, Coal, &c. found in a Coal 

 Pit at the West End of Dudley in Staffordshire. By Mr. Fettiplace Bellers, 

 F. R. S. To which is added a Table of the Specific Gravity of each Stratum. 

 By Mr, Fr. Hauksbee, F. R. S. N^ 336 p. 541. 



1, A yellowish clay, immediately under the turf j 2, a bluish clay j 3, a bluish hard clay, called 

 by the miners clunch. This is one of the certain signs of coal. It has in it mineral plants; 4, a 

 bluish soft clay J 5, a fine-grained grey stone; it lies next the former, and is found in some pits only; 

 6, a clay almost like the first, only whiter; 7, a hard grey rock: with something like the impressions 

 of vegetables, but none distinct; 8, a blue clunch, like N° 3, with mineral plants in it; 8, +, this 



