S8 Circulation of Water hy MacMnery. 



boilers antl tubes burnt out since the hot-water system commenced, that 

 we deem it our duty to state, thus freely, our opinion. It is true that 

 cast-iron tubes, such as those of Mr Weekes, or the wrought-iron ones of 

 Mr. Perkins, may be renewed at very little expense; and also that, if 

 distilled water only were used, the deposit would be much longer in taking 

 place. In particular situations, therefore, the tube system may unquestion- 

 ably be the best. — Cond. 



Art. VIII. A short Notice of Mr. Busby s Method of circulating 

 Water, hot or cold, by the Aid of Machinery. By the Conductor. 



This method is described at length in the Repertory of 

 Patent Inventions for September, vol. iv. new series, p. 137. 

 As it is not particularly adapted for hot-houses, we shall not 

 o-o much into details ; but simply state that the circulation is 

 effected by an apparatus which may be compared to the wheel 

 of a winnowing machine, and which is fixed on a perpendi- 

 cular axis within the boiler (which must be circular), with its 

 axis as nearly as possible over the end of a pipe which reaches 

 from the circumference to the centre of the boiler. There is 

 another pipe, which reaches no farther than the circumference. 

 These two pipes may descend or be conducted to any distance, 

 being united at their farther extremity so as to form only one 

 pipe. The whole being then filled with water, the fan or cir- 

 culator is made to revolve, by the action of the smoke and hot 

 air of the chimney-flue, upon the fans of a common smoke- 

 jack; and the result is, a rotatory motion communicated to 

 the fluid in the boiler, the centrifugal force of which will so act 

 against the fluid in the pipe terminating in the circumference, 

 as to force the water down it, while it draws it out of the other. 

 It is evident that, by this apparatus, either hot or cold water 

 may be circulated with equal ease ; the circulation depending 

 entirely upon the centrifugal force, and the orifice of one pipe 

 being in the centre, and the other in the circumference, of the 

 boiler. The result is certainly such as would not easily have 

 been anticipated. " To prove the efficacy of his invention, 

 Mr. Busby has had an apparatus, on his principle, fixed on 

 the premises of Mr. Eckstein, ironmonger, in Holborn ; and, 

 on the 9tli of August, a numerous meeting of engineers and 

 gentlemen of science took place, to witness its performance. 

 The furnace is situated in a workshop on the second floor; 

 and the heated water, urged hy the circulator, passes through 

 inch pipes to a receptacle in the open shop on the ground- 

 floor, having descended 21 ft. heloxv the furnace. The expe- 

 riment succeeded completely, and gave universal satisfaction. 



