NO. I FUEL ECONOMY — MITMAN I9 



attention at intervals during the day and then, at best, of a perfunctory 

 nature. Accordingly, the use of control instruments of the order 

 mentioned for household furnace operations is of no advantage since 

 these instruments are only indicators of conditions and guides to 

 efficient combustion. 



Instruments as a guide to chemical control become applicable as 

 attention to furnace operations becomes more or less constant ; in 

 other words, as the consumption of coal reaches the stage of tons 

 per day. One plant may feel justified in supplying draft gages only, 

 while another may be able to provide a gas analyzer in addition, 

 but just in proportion as a complete system of control is instituted 

 there is the consequent assurance of securing definite economies. 

 Irrespective of the actual savings to be effected, the application of 

 chemical control by all consuming interests must bring about that dis- 

 criminatory knowledge of the general subject which is now largely 

 lacking. Once this is attained and standard practices are established, 

 the consumer will be in a position to demand and receive uniformity 

 and service of the marketing interests. 



