180 REPORTS ON THE STATE OF SCIENCE.—1914. 
reported. Dr, Clerk consented, however, to act as Vice-Chairman, 
and Professor Dalby was appointed Secretary. 
The Committee allocated the whole of the grant to the Secretary 
for the purpose of providing him with a permanent research assistant 
to carry on the work. It was stated that Professor Dalby and Dr. 
Clerk were engaged on the design of an experimental plant to be 
placed in the new laboratory of the City and Guilds (Engineering) 
College. 
Six notes, relating chiefly to heat flow, temperature, and leakage, 
are briefly summarised. 
Object of Present Report. 
The following report is devoted partly to the special consideration 
of temperature measurements and subjects arising therefrom, and partly 
to the illustration of the use which can be made of the data obtained by 
the Committee. 
Methods of Measuring Temperature of the Charge in a Gas-engine 
Cylinder under working conditions. 
One of the problems requiring solution was the direct measurement 
of the temperature of the working agent in the cylinder while the 
engine was running under ordinary working conditions. The difficulty 
of making this measurement arises from the fact that during the 
explosion of the charge in the engine cylinder the temperature is 
sometimes higher than that of the melting-point of platinum or of the 
couples which can be put in the cylinder to make the measurement. 
In Note 32 is described a method devised by Professors Callendar 
and Dalby,’ which for the first time enabled direct observation of the 
1 Proc. Roy. Soc., A., vol. 80, 1907. 
