348 PHILOSOPHICAL TRANSACTIONS. [aNNO I676. 



drying weather, and sometimes of frost or cold in winter ; heat or scorching in 

 summer in a clear day. But on the contrary, the south winds blowing, or the 

 west and south-west, the deal then always relaxes, or at least is at a stand, 

 provided this happen in the day time; for if in the night not so much; and so 

 this will do some considerable time before rain. — By a constant observation of 

 this experiment of the deal's motion and rest, you may be able to guess at the 

 situation of the wind, without a weather-cock, provided you have a common 

 and a sealed thermometer. — Also you may know the time of the year; for in 

 the spring it moves quicker and more, than in winter ; in summer it shrinks 

 more than in the spring ; in autumn it is less in motion than in summer. 



The Explanation of the Second Contrivance hy a Circular Motion for an Annual 

 Revolution; and first in the Outward Parts i represented in Fig. 5, PI. 11. 



A AAA is the frame of wood for the pannels of deal to play loose in, at top 

 and bottom. — BBBB, the crosses of deal or iron fastened to the frame on each 

 side; to which is annexed the circular index, divided into 12 parts; in the centre 

 of which the axis b for the hands is placed. — CC, the two pannels of slit deal, 

 each 3 feet deep, and 3 feet broad ; fastened at each end of the frame^ with a 

 distance left in the middle for the scope of the motion. 



The Explanation of the Inward Work in Fig. 6. 



Aj A, the two hands. — B,b, the two brass pulleys or rollers, the one larger, 

 the other less ; to the larger a fiat leaden weight is fastened with a cat-gut string ; 

 to the smaller is fastened a small silver chain, which is by the noose or loop of 

 the brass C, to be fastened to the pannel under the middle of the cross near the 

 gap or scope for the motion ; and in the noose the chain to have a fastening, to 

 be taken up or let down at pleasure. — D, the roller or pulley, to be placed on 

 the other pannel opposite to the noose, and near the gap or scope between the 

 two pannels; over which roller the small chain on its return to the axis is to be 

 placed. — E, the axis on which the two rollers or pulleys B, b, are to be fastened, 

 and the two hands A, A, for the index.— F, the weight annexed to the larger 

 roller or pulley B, and the string or catgut to be moved, is to have the contrary 

 posture for motion to the small roller or pulley, on which the silver chain is 

 fastened : so that, as the shrinking of the pannel moves the axis one way, the 

 relaxing may give way to the moving the hands or axis the other way by the 

 power of the weights. 



The circumference of the smaller pulley or roller Bb, on which the chain is 

 fastened, is to be no larger than just so much scope or distance as the two 

 pannels make by the extremity of their utmost swelling or shrinking ; and so 



