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engine, the Indianapolis Water Company, with great liberality, arranged 
for a second test which should be so complete as to admit of a thorough 
analysis of its action. This second test was run early in the present 
month (December 3, 1898), and, while all the facts to be derived from it 
have not yet been determined, enough is known of them to make certain 
the accuracy of the previous work. The exceptional performance of the 
engine having, therefore, been carefully established, it is evident that the 
engine represents a very high standard of engineering practice. It marks 
the engineering progress of the day. This makes it not only a machine 
in which its owners may take just pride, but one which lends lustre to 
the whole State. 
Tests TO DETERMINE THE EFFICIENCY OF LocoMOTIVE BoILER COVERINGS. 
By W. F. M. Goss. 
The extent of heat losses occurring by radiation from a modern loco- 
motive boiler under service conditions has long been a matter of specula- 
tion. There have been many investigations to determine the radiation 
from pipes and other steam heated surfaces, usually within buildings, 
but until recently no tests have been made which would disclose the 
effect of the air currents which, at speed, circulate about a locomotive 
boiler. 
During the past summer (1898), however, Mr. Robert Quayle, Superin- 
tendent of Motive Power of the Chicago and Northwestern Railroad Com- 
pany, in co-operation with manufacturers of boiler coverings, and, with 
the assistance of the undersigned, undertook to determine both the heat 
losses from a boiler and the relative value of several different makes of 
boiler coverings designed to reduce such losses. The following is a brief 
abstract of a report of results submitted to Mr. Quayle: 
In carrying out the tests, two locomotives were employed; one to be 
hereafter referred to as the “experimental locomotive’ was subject to the 
varying conditions of the test; the other being under normal conditions 
and serving to give motion to the experimental locomotive, and, also, as 
a source of supply from which steam could be drawn for use in maintain- 
ing the experimental boiler at the desired temperature. The experimental 
locomotive was coupled ahead of the normal engine, and, consequently, 
