VOL. LII.] PHILOSOPHICAL. TRANSACTIONS. 633 



been taken from a stone quarry, above a quarter of a mile distant. They were 

 disposed in a circular form, but a part of the circle is vacant; though it is probable 

 it was not so at first ; as there were found several bones and teeth in that space ; 

 the cause might be, that as part lay next the road, it might have met with an 

 accidental disturbance; or, what is yet more likely, the people that came to draw 

 the stones away, beginning on that side of it, destroyed that part before they were 

 aware that it was any ways remarkable or worthy note. 



There is one circumstance that seems to denote the monument to have been 

 rather modern, which is this: It appears from the best observations he could 

 make, that a wall of the field cutting off a small segment of the circle, marked d, 

 was erected before the monument was made, as it is hardly probable that the per- 

 sons who built it, would be at the trouble to remove that part of the circle that 

 was without, for the sake of building a field-wall entirely level ; which is the case, 

 for all that portion of the circle, from the inside of the wall, was as level as 

 any other part of the field ; and as walls are not probably of very ancient date 

 here, (if the above be a fact) he concludes, that the monument must have been 

 erected in some of the wars of the houses of York and Lancaster, or later. The 

 several coffins were about 2 feet high each : the two complete ones about 7.6 long 

 each ; and the others had the flat stone nearly the same length ; but the cover- 

 ing extended only as far as the breast. 



XCl. Description of the Hiero Fountain at the Chemnic Metal Mines in Hun- 

 gary, erected in the year 1756. By Wolfe^ M.D. From the Latin, 

 p. 547. 



This machine, though it has nothing new, seems not unworthy to be known, 

 both as it is thought the only one of its kind, applied to a large work, and be-^ 

 cause of the singular generation of snow and ice, observed in its operation. 



In pi. 15, fig. 1, N isa wooden cistern at the middle of the mountain, at 143 

 feet above the horizontal plane, into which the waters from a higher mine are 

 received, o is a similar cistern, at the top of the mountain, 260 feet above the 

 plane, into which the rain waters are led for assisting the work, a is an air vessel, 

 at the foot of the mountain, into which the water from the cistern n or o is 

 emitted, by the tubes rt or gt, and the cock h, by the force of which the air is 

 compressed, and propelled through the tube lmm into a lower vessel, b is a simi- ~ 

 lar vessel in the bottom of the mine, 104 feet below the vessel a, which receives 

 the water from the cistern d collected in the mine, which, being compressed by the 

 force of the air coming from the upper vessel, is raised and discharged through 

 the tube qsf. k is a tube with a cock for letting out the water from the vessel 

 A, after the work is finished, for which purpose also the tube i sometimes serv^es. 

 L transmits or stops the air. The cock e of the little tube ought to be open, 



VOL. XI. 4M 



