Jdlt 6, 1917. 



The Florists' Review 



75 



Getting Down to the Real Facts 

 About Flues on Tubular Boilers 



FIND out the actual inside diameter of the flues 

 on practically any tubular boiler that you know 

 anything about, and you will find they measure 

 as low as two inches and seldom, if ever, more 

 than three. 



Such tubes choke down the combustion. 



This is why. 



The flames and gases coming directly from the 

 flre, contain a surprising quantity of half burned 

 coal, black sooty stuff, and also cinders. 



The small tubes cool the flames and gases down 

 to such an extent that the sooty parts stick to the 

 sides of the tubes, or go up the chimney in black 

 smoke. 



Such smoke is simply unburned coal or money 

 wasted. 



The soot and cinders filling up the tubes, choke 

 the draft, causing more and more of the coal to go 

 up the chimney unburned. Sticking to their sides, 

 it also prevents the water from quickly absorbing 

 the amount of heat it should. 



In comparison, look at those two big tubes in 

 the Burnham. 



They are so large that the flames continue to 

 burn the gases and unburned parts of the coal 

 throughout their entire length. The rear combus- 



tion chamber or space into which they lead, allows 

 a further burning. 



|pv:--t;i. ■ '"•SV - 



All this happens before the 4-inch tubes are 

 reached, which means that the soot and gases 

 are fully burned, giving off much heat otherwise 

 wasted. 



The 4-inch tubes are kept surprisingly free from 

 cinders, because they drop to the bottom of the 

 rear combustion chamber, from where they are 

 easily removed. 



You can plainly see that the big flues and the 

 rear combustion chamber are practically as good 

 heating surfaces as the fire-box itself. Also that 

 only the clean, fully burned gases enter the 4-inch 

 tubes, which extract nearly all the remaining heat 

 before they have a chance to go up the chimney. 



In this Burnham Tubular, you not only have 

 tubes made of long-lasting charcoal iron, instead 

 of short-lived steel, but a size and arrangement 

 that produces ideal burning conditions for even the 

 lower grades of fuel. 



There being no dead heat absorbing masonry, 

 the water because it surrounds all flues and the 

 fire-box as well, simply squeezes the heat right 

 out of the coal. At present price of coal, such a 

 heat squeezer means a big saving. 



For further facts, send for circular of this new 

 Burnham, made at our factory at Geneva, N. Y. 



NEW YORK 

 42d Street Bldg. 



BOSTON 

 Tremont Bldg:. 

 TORONTO 

 Royal Bank Bldg. 



Builders of Greenhouses and Conservatories 



SALES OFFICKS 



PHILADELPHIA DETROIT 



Wldener Bldgr. Book Bldg. 



CHICAGO 

 Continental & Commercial Bank Bldg. 



FACTORIKS: IRVINGTON, N. Y. 



DES PLAINES. ILL. 



C4ENEVA. N. Y. 



ROCHESTER 

 Granite Bldg. 



MONTREAL 

 Transportation Bldg, 



CLEVELAND 

 Swetland Bldg. 



ST. CATHARINES, CANADA 



