282 Experiments on the Strength of 



nity, containing inexhaustible quantities of Limestone, 

 which could he conveved by (Antrim, Sec.) Boats, re- 

 turning from x'\rmagh." The shores of Lough Neagh ap- 

 pear aUo (o be flat on al! side;*, I understand, so that lower- 

 ing its water IS niches, would probal)Iy regain 170O acres 

 or more to the Land, from a Lake of 60,000 acres, now 

 45 feet deep in the middle, and pretty gradually shallowing 

 to all its extremities, Mr. D. p. lOi : its deepest part being 

 one foot above the level of tlie Sea, as appears by the levels 

 of the Belfast and I>)ugh Neagh Canal, Mr. D, p. 365, 

 althoucrh in p. 103, its bottom is said to be three feet lower 

 in some places than the surface of the Sea at the outlet, by 

 the course of the Bann, obstructed by solid dams of Basaltic 

 Rock^. These circumstances will, I trust, show the pro- 

 priety, of mv considering the bottom of the great 'IVough 

 in the NE of Ireland to dip soulhwaid, rather than north- 

 ward as Dr. R. at page 201 and 202 of your 33d voh and 

 pace 376 vol. XXXV. seems to represent; but which it is 

 plain he could not mean, as at pages 105 and 107 of voL 

 xXxiii. and elsewhere, he represents the strata as rising to- 

 wards the north : the word " section," line three from the 

 bottom of p. 201, vol. xxxiii., being inaptly applied to the 

 edces* of the strata, which edges without doubt rise south- 

 wardly, for some miles from the north Coast, as slated 

 p. 376; owing, doubtless, to the E and W dip towards 

 the b'jttom of the trough, increasing, through that distance, 

 and producing twisted or winding surfaces, rather than ma- 

 theiTiatical planes in the Limestone and other strata; for 

 the water of Lough Neagh in its deepest part, probably, £ 

 think, rests on strata of Basalt, that are several hundred 

 feet elevated above the sea on the north of Coleraine. 



[To be continued.] 



XLL Experiments on the Strength of Men and Horses in 

 moving Machines. Bij M. ScHULZEf. 



JL hose who have had occasion to construct machines in- 

 tended to be moved by men or animals, are sufficiently 

 aware how important it is to be acquainted with the quan- 

 tity of motion that can be attributed to either of them, in 

 order to estimate with accuracy the effect which it is pro- 

 posed to obtain by the machine. It is well known that 

 the arrarigement of the whole depends entirely on the ratio 



* A phraseology too- common with some Geologists. 

 •}■ Translated from the Memoirs of the Royal Academy of Sciences of 

 Berlin for 1783, by T. S. EranK 



of 



