VOL. XXXVI.] PHILOSOPHICAL TRANSACTIONS. 369 



Feet. Inch. 



On the 1st of October, they found 55 10 



On the 2d, at 5 in the afternoon lOQ 8 



On the 3d, at 3 in the afternoon 132 6 



On the 4th, at 3 in the afternoon 149 6 



On the 5th, at 4 in the afternoon 161 3 



On the 6th, at lO-i- in the morning 167 8 



On the 7th, at 4 in the afternoon 17-1 O 



On the 8th, at 7 in the morning 176 7 



and still continued to increase, though slowly, owing to the weight of water 

 which the spring through the hole of the trunk must force up, and the 

 well being wider aloft than below. They bored 81 feet below the foot of the 

 trunk before they met with this body of water, which by computation is 

 166 feet below the deepest place in the adjacent seas. The water proves 

 excellent, is soft, sweet and fine ; on comparing it with the best spring water 

 brought from Milton, the former was found the best. It lathered well with 

 soap, and boiled old pease very well; and they had great reason to believe, 

 that the spring will sufficiently supply his Majesty's ships, as proposed. 



Observations on the Crane, with Improvements. Bj J. T. Desaguliers, F. R. S. 

 N° 411, p. 194. 



When heavy weights are to be raised from a great depth, and laid on car- 

 riages very near the precipice, as at the edge of a stone quarry, the crane 

 must be a fixed one, and only the gibbet moveable, from which the weight 

 hangs, as in fig. 1, pi. 9. Here, in the common way, the rope Rrr, or chain, 

 which runs over the gibbet, goes between two pulleys, p, q, fixed within the 

 upper horizontal beam of the crane aqtx, above the axis of the gibbet bgv, 

 so as to be carried easily to the right or left hand, from w to w, when the 

 gibbet turns on its axis, to bring the burthen over the carriage designed to 

 receive it. For this purpose, a small rope, called the guide-rope, is fastened 

 to the weight, or to the upper part of the gibbet near its extremity, g, which 

 a man is to pull, to bring the weight over the place, to which it must be 

 lowered. Now in performing this, the main rope or chain not continuing 

 parallel to the arm of the gibbet, gives the weight a tendency towards that 

 side to which it deviates, and that sometimes so suddenly, that without care, 

 and much force applied, if the weight be very great, the burthen will swing 

 to or from the carriage, so as to break every thing in its way. Sometimes a 

 horizontal piece, like a handspike, is fixed in the upright shaft of the gibbet a 



VOL. VII. 3 B 



