414 



BEPORT — 1894. 



the wire-drawing part would generally, for practical purposes, lead to an 

 error of no great importance, at any rate, when the steam had initially 

 more than 1 per cent, of moisture. Further, the separator on the Barrus 

 calorimeter is not quite so well arranged as that of the Carpenter calori- 

 meter. The steam leaving the latter is no doubt drier than that leaving 

 the separator of the Barrus calorimeter. 



Test of a Carpenter separating Calorimeter, shmving the Injinence of 

 Radiation from the Steam Pipe in prodtmng Moisture in Steam. — The 

 Barrus calorimeter and Carpenter calorimeter were fixed side by side for 

 comparative tests. A branch pipe 30 feet long brought the steam from 

 the main steam pipe, which delivered steam to the engine. This pipe was 

 well clothed with Iveenan's composition. The engine was running, so 

 that there was a considerable flow of steam along the main steam pipe. 



Two pairs of tests were made. In one the Carpenter calorimeter alone 

 was used, and the flow of steam along the 30-foot branch pipe was com- 

 paratively slow. In the other pair, steam was flowing through the Barrus 

 calorimeter also. As this uses twice as much steam as the Carpenter, the 

 rate of flow was about three times greater than in the first pair of tests. 



Test with Carpenter separating Calorimeter at the Central Technical 

 College, March 28, 1894. 



The only difierence in these two sets of experiments was that the rate 

 of flow along the branch steam pipe was different. In the first set the 

 mean moisture was 13"82 per cent., in the second set 3"93 per cent., being 

 greater when the steam current was slower. The difference is due to 

 condensation in the steam pipe. The result is important as showing 

 how large the proportionate condensation may be, even in a well-clothed 

 steam pipe, when the rate of flow is small, and also how important it is, 

 in using calorimeters of this kind, which take only a small quantity of 

 steam, to place them closely adjacent to the engine or boiler tested. 



Siynultaneous Wire -drawing and Salt Test on a Babcock Boiler at the 

 Central Technical College. — Steam was taken by a short pipe clothed with 

 felt from the casting carrying the safety valve at the top of the boiler. 

 This pipe branched to the Barrus calo)-imeter and to a worm in a cold- 

 water tank, closely adjacent to each other. The following table gives the 

 Barrus calorimeter results in full to show the consistency of the deter- 

 minations : — 



