Mx lA\xn3iy'‘s New and PoriaUe Mthrioscope. 357 
i‘ise in the tube, and its height be determined by the attached 
scale. On replacing the lid, the eifect is extinguished. The 
radiation of caloric from the surface of the sentient-ball to the 
heavens is thus clearly indicated. 
When the observation is completed, the upper glass-ball is 
taken off, and thereafter the spherical cup. The tube with its 
scale is then removed from the lower ball, which last being- 
secured by a stopper, the whole is put up in a small case. 
It is evident that the ^thrioscope now described, is easily 
converted into a Hygrometer; — for this purpose it is merely 
necessary to unscrew the hollow spherical cup, and cover the 
sentient ball with muslin or a bit of tissue-paper, and the in- 
stant this is moistened, the coloured fluid will begin to ascend 
from below. 
By merely coating the lower ball with China ink, or gilding 
it, the instrument becomes either a Photometer or a Pyroscope. 
Art. XXI. — Description a Copper Battle-Axe found in 
Ratlio Bog^ and now in the possession of Andrew Wad- 
dell, Esq. F. B. S. E. ^ 
In carrying the Union Canal through Radio Bog, on the 
estate of Bonnington, and county of Mid-Lothian, it was ne- 
cessary to execute some very deep cutting at Wilkie’s Hill, at 
the head of the bos;. 
After descending through nine feet of moss.^ and seven feet 
of sand, the workmen came to the hard, black till-clay ; and at 
the depth of four feet below its junction with the stratum of 
sand, they found the head of a Battle-Axe, of an unusual kind. 
It consists wholly of pure copper. Its length is four inches 
Jive-tenths and a haf. Its maximum breadth, or the chord of 
its circular cutting edge, is three inches ; and its least breadth 
two inches. Its cutting edge is composed as it were of two 
edges of different inclinations ; and as it has no provision made 
in the metal for the reception of a handle, it must have been 
Bead before the Society of Scottish AntiquarieB, Feb. 11. 1S22. 
VOL. VI. NO. 12. APRIL 1822. A a 
