no PHILOSOPHICAL TRANSACTIONS. [aNNO 1745. 



into the pipe with a great velocity ; but, since it passes through the throat of the 

 funnel, which is of a smaller bore than the pipe, room is left all round the vein 

 of water for the air to enter at the air-holes. 



It no sooner enters than it mixes with the water, on account of the rapidity of 

 the motion; and both together make a white froth, and entirely fill the bore of 

 the pipe. When this froth falls on the stone in the tub, it is dashed into small 

 particles, which disengages the air from the water. The air cannot get out at 

 ?«, the end of the pipe, because it is filled with the froth, which falls with a great 

 force ; neither can it get out at the hole i, because the surface of the water is kept 

 so high above it; for which reason it rushes out at n; and if the hole n be 

 stopped, the air will soon force all the water in the tub out at i, and then follow 

 it. The most convenient way of regulating the blast, is to bore a small hole in 

 the blast-pipe, and, by the help of a pin in it, to let out what air there may be 

 more than is wanted. 



The dimensions of such an engine sufficiently large to smelt harder ore than 

 any in lead-hills, are as follow : 



Height of the funnel 5 feet; length of the pipe 14, 15, or l6; height of the 

 tub 6; diameter of the tub 54-; height of the stone in the tub 2. 



Diameter of the throat of the frinnel 3^- inches; diameter of the bore of the 

 pipe 5-i-; diameter of the blast-hole at n 1-i; hole at i about 5 inches square, 

 diameter of the air-holes 1-l. 



This engine is also of great use to convey fresh air into the works; which saves 

 the double drifts and shafts, and cutting communications between them. A small 

 one will do very well for a blacksmith. 



Some Additions to the Statical Experiments printed in N" 470. By Dr. John 



Lining, at Charles -Town, South Carolina. N" 475, p. 318. 



These additions are of no use now. See the former part at p. 683, vol. 8 of 

 these Abridgments. 



Concerning an extraordinarily large Fossil Tooth of an Elephant. By Mr. Henry 



Baker, F.R.S. WAT 5, p. 331. 



The fossil tooth Mr. B. received from Norwich. It seems to be a grinder 

 belonging to the left under-jaw of a very large elephant, as its own size and weight 

 may show : for the circumference, measured by a string drawn round the edge, is 

 3 feet, wanting 1 inch; in length it measures 15 inches; in breadth, where 

 widest, 7 inches, in thickness about 3 ; and its weight is upwards of 1 1 pounds. 



On one side it is convex, and on the other concave, with 1 6 ridges and furrows 

 running on each side transversely, and corresponding with the same number of 

 eminencies on the grinding edge, which appears furrowed like a millstone. On 



