156 PORTABLE WIND MOTOES APPLIED TO 



the machine. Each vane weighs from 11 to 13 Ibs. ; one 

 man may fix four per minute, and remove six in the same 

 time, that is to say, that eight minntes are sufficient to 

 fasten all the vanes on, and five minutes only to remove them. 



Mechanism. A shaft (Fig. 97), 4 T 3 - inches in diameter, 

 inclined 5 40' from the horizontal, carries the circle of vanes 

 and a pulley P made of ashwood, and revolves through three 

 collars, R R' R". The collars R R' are bolted right down to 

 the foundation iron beam Q, by four long iron rods. 



The circular iron plate N, 3fb. 6in. in diameter, is keyed 

 on the shaft by a conical adjustment, serving as an abut- 

 ment against the collar R x , forming a very strong and rigid 

 assemblage able to sustain the enormous strain during stop- 

 pages. Round the plate N is a steel band, provided with 

 wooden brakes faced with leather, fixed by one end to the 

 frame, and by the other to a lever S (Fig. 98), multiplying 

 the weight of the man by 8, and what is more, the brake 

 acts in the direction of the rotation. 



Transmission. A pulley P, 4ft. Oin. in diameter, 

 keyed on the shaft 0, transmits the rotary motion by a 

 crossed belt to another pulley T of the same diameter. The 

 shaft U of the pulley T is parallel to the shaft 0, and carries 

 a steel bevel-pinion V, of 7 inches diameter, provided with 

 ten teeth which can be thrown in or out of gear by a lever X 

 with a large cog-wheel Y, keyed on the shaft of the drum Z. 



Drum. The bevel cog-wheel Y is 4ft. Sin. in diameter 

 and carries 44 teeth. The drum is 1 7-J inches in diameter, 

 3ft. 3in. with the flanges. 



The cable is ^ inch in diameter, 220 to 270 yards in 

 length. 



Working. During the night the vanes of the lower part of 

 the wheel only are left on to prevent it from revolving. 

 Therefore, in the morning four minutes are required to place 

 the sixteen vanes in position again, then the brake being on, 

 the pinion V is thrown into gear with the cog-wheel Y and 

 the brake released; the wheel then starts turning, revolving 

 the drum, which winds the cable at a speed varying between 

 6 to 14 inches per second, according to the power of the wind. 

 A cable-carrier is placed on the ground 10 feet from the 

 machine, and level with the middle of the drum; the machine 

 goes on working in this manner while the plough is hauled 

 with great smoothness and steadiness. When the plough is 

 close enough to the motor, the speed is decreased by means 



