

Adgust 17, 1916. 



The Florists^ Review 



119 



Out No. I— Showing deep, narrow water ways 

 |iiji|ll{ll tlrectly over the hottest part of the Are. 



Cut No. 8— Shows the secondary crown 

 sheet at the right. 



Out No. 2 — A rough sketch of the over-tbe-flre water 

 ways, to emphasize in your mind their key hole shape. 



The Burnham's Secondary Crown Sheet 

 a Great Economy Feature 



NEW YORK 

 42d Street Bldg 



n 



|ET'S get right down to bed- 

 rock on the question of the 

 Burnham's economies. Let's 

 see what they actually are; 

 and prove to each of ourselves that 

 Burnham greenhouse boilers have 

 some surprising economy construc- 

 tion features. 



tJROWN SHEET 



Glance at cut Number One and 

 you will see that running across the 

 boiler, directly over the fire, are 

 deep, narrow water ways, between 

 which the flames, when hottest, come 

 in direct contact. < They form the 

 crown sheet of the boiler. The fire 

 comes against two sides and the 

 bottom of these deep water ways, 

 instantly giving to the water its 

 greatest heat. 



WHY KEY HOLE SHAPED 



Now look at cut Number Two. It 

 shows you the actual key hole shape 

 of these same across-the-boiler water 

 ways. You can see how narrow and 

 deep they are; making it possible for 

 them to carry a thin amount of 

 water, that will heat quickly. 



Their shape is based on exactly 

 the same principle as a kitchen 

 stove with a wide bottomed pan 

 filled with but shallow water; heat- 

 ing so much quicker than a narrow 

 bottomed kettle containing exactly 

 the same amount, but deeper water. 



It's just common every day 

 kitchen sense, applied to a boiler. 

 RAPID CIBCULATION 



Now another thing about the key 

 hole shaped water ways. That in- 

 creased size at the top gives ample 

 room for expansion and rapid cir- 

 culation — a point of no small im- 

 portance. 



So much, then, for the harnessing 

 up of the hottest part of the fire. 

 Now let 's take a glance at what 

 next happens to it, on its way to the 

 chimney. 



SECONDARY CROWN SHEET 



Between each section on each 

 side of the boiler, are flue openings, 

 up which the fire goes, coming in 

 contract with water ways on the 

 sides and top. 



Going up these side flues as it 

 does, with considerable speed, it 

 comes forcibly in contact with the 

 water way at the very inside top of 

 the boiler, which forms, as you now 

 see, a secondary crown sheet. 



With the water boiler, this sec- 

 ondary crown sheet gives an extra 

 push to the water at a point where 

 it is about to leave the boiler and 

 go into the mains. It means in- 

 creased circulation speed. 



With the steam boiler, it means 

 a hotter, drier steam. 



This secondary crown sheet is one 

 of the Burnham's important econ- 

 omy features. 



BACK AND FORTH TRAVEL 



After coming in contact with the 

 secondary crown sheet, then starts 

 that famous Burnham "3 Times 

 back and forth fire travel" for 

 which the boiler is so well known. 



It's "that long fire travel that 

 also has much to do with making 

 the short coal bill." 



Back and forth the hot gases 

 travel until they reach the smoke 

 box and chimney with only just 

 enough heat left in them to produce 

 the necessary draft. 



There are several other Burnham 

 economies well worth mentioning, 

 but these are the big ones — the ones 

 to^ keep in mind when some one 

 tries to tell you that any other cast 

 iron boiler can heat a greenhouse as 

 economically as the Burnham Green- 

 house Boiler can. 



Bailroads are crowded with busi- 

 ness. Freights are slow. So order 

 ahead of time, if you want your 

 boiler on time. 



lord.&Btiniham^ 



Builders of Greenhouses and Conservatories 

 8AXX8 orricKs 



BOSTON 

 Tremont BIdg. 



PHILADELPHIA 

 Wldener BIdg. 



TORONTO 

 Royal Bank Bldgr. 



r ACTORIK8 i IRVINGTON. N. Y. 

 I DES PLAINE8, ILL. 



CHICAGO 

 Rookery BIdg. 



MONTREAL 

 Transportation Bldg. 



ST. CATHARINES, 

 CANADA 



ROCHESTKR 

 Granite Bldg. 



CLEVELAND 

 Shetland BIdg. 



