the discharge per hour from the two bags or buckets comes 

 to 252 cub. ft. of which 35 per cent, may be calculated 

 for wastage. Thus we arrive at 165 cub. ft. or 1045 gallons per 

 hour. The ratio of power to weight where the diameter of 

 whim and bullock-walk are 3ft. and i6ft. is 3 : 16. The 

 total weight raised each time being 460 Ibs., the draught 

 exerted is 124 Ibs., or considerably less than in the case of the 

 single-mot. (6) To work the single Persian wheel also i 

 man and 2 bullocks (or even i bullock) besides the man 

 distributing water, are required. The water being raised 

 40 ft., the diameter of the driving wheel being 4 ft., the 

 diameter of the wheel to which the buckets or pots are attach- 

 ed being also 4 ft., assuming the content of each bucket 

 cub. -ft. and 6 buckets being emptied at each turn of the 

 bullocks, the discharge at each turn comes to J cub. ft. The 

 length of the bullock-walk being 62 f 8ft. and the speed of 

 bullocks being 2 miles an hour, the bullocks make 2*8 turns 

 per minute. The discharge per hour is therefore 126 cub. 

 ft. of which 45 per cent, may be allowed for wastage. The 

 actual discharge thus comes to 69*3 cub. -ft. or 429 gallons 

 per hour. The buckets being tied 2ft. apart from middle 

 to middle, the number of buckets in one endless chain is 

 40. The weight* of buckets is about Solbs. 20 buckets being 

 always full the weight of water they contain is I561bs. The 

 weight of the rope is 22lbs. The total weight raised is 

 therefore 2581bs. The modulus being '6, the power required' 

 to raise 2581bs. is 43olbs. The ratio between this power 

 and the power exerted by bullocks being about 1:5, the draught 

 or power exerted is only 861bs., which is lighter still than 

 in the case of the Double- mot. Such a Persian wheel can 

 be worked by i bullock only. 



239. From the above figures it may be seen that the native 

 irrigation appliances are by no means to be despised, and 

 that taking all things into consideration we come to the 

 following conclusions :(i) the Ddn is the best implement 



