64 BOILEB TESTS. 



In conclusion, it should be stated that the various boilers 

 and appliances to which the paper refers are not designated by 

 their commercial names, and no mention is made of the local- 

 ity where they are in use. The desire to give prominence to 

 principles rather than to individual methods of carrying out 

 the principles, and to remove from the discussion all matters 

 bearing upon purposes of trade, has led to this course. Fur- 

 thermore, it was on condition that the tests should be treated 

 in this impersonal way that the interested parties, with a single 

 exception, granted permission for the public use of the results. 

 The exception is the case of the tests on boilers Nos. 64, 65 

 66 and 71, which are of the Babcock and Wilcox type. 

 These are given with the permission of the manufacturers 

 of the boilers, on behalf of whom the tests were made. 



