272 



PI R T I C IT L T U R E 



August 19, 1916 



Cut Number One, showing 

 deep, narrow water ways di- 

 rectly over the hottest part *tf 

 the Are. 



The Buamlhi 



tj . -kMMHMwwMwUr: 



Cut Xuniber Three. Shows 

 the seeondar>' erown sheet 

 at the ri«hl. 



Cut Xuinher Two. A roimh 

 sketch of the over-the-flre 

 water ways to emphasize in 

 your niin<I their key hnli> 

 shape. 



Grealh Ec 



nomj Feature 



O 



LET'S get riglit down to bed iwiek on 

 tbe question of the Biirnliam's 

 eeonomies. Let's see what they 

 actually are: niul prove to each of our- 

 seh-es that Bunihiun greenhouse boilers 

 have some surprising economy construc- 

 tion features. 



CROWN SHEET 



Glance at c lit Number One and ycui will 

 see that running: across tho boiler, di- 

 rectly over the fire, are deep, narrow 

 waterways. between which the thnnes 

 when hottest, come in direct conlact. 

 They form the crown sheet of the boiler. 

 The lire comes against two sides and 

 the bottom of these deep water ways, in- 

 stantly giving to tile 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 thev 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; heating so much quicker 

 than a narrow bottomed kettle contain- 

 ing exactly the same amount, but deeper 

 water. 



It's Just common every day kilchcn 

 sense, ajqilied to a boiler. 



RAPID CIRCULATION 



\"w .Ml..! her thing al...iit the kcv 

 sliapcil water ways. That ilicrc 

 size at the top gives ample room 

 expansion and rapid circulation— a i 

 of no small importance. 

 So miiih. then, for the harnessing u 

 the hottest part of the fire. Now 

 fake a glanci^ at what next happen 

 it, on its way to the chimney. 



hoh' 



[ised 



for 



iiint 



p of 

 let's 

 s tc> 



SECONDARY CROWN SHEET 



Between each section on each side of 

 the boiler, are flue openings, up which 

 the Are goes, coming in contact with 

 water ways on the sides and top. 

 Going up these side fines as it does, 

 with con^ideruble speed, it comes forci- 

 bly in conlact wllli the water wav at 

 tile very inside top of the boiler, which 

 f'lrins, .IS yon lo.w see, a speonilnry 

 (Town tslieet. 



^^'ith the w.'iter boiler, this secondary 

 crown sheet gives an exira push to the 

 water at a point where it is about to 

 leave the boiler and go into the mains, 

 It_ means increased circulation speed. 

 With the steam boiler, it means ,'i hot- 

 ter, drier sleam. 



This secondary crown sheet is one of 

 the Bnrnhnm's important economy feat- 

 ures. 



BACK AND FORTH TRAVEL 



After rnniing in .uiita.t with the so<'- 



oiidnry .rcivMi si l. then starts thai 



f.inious r.nrnh.'ini ":i Times back nnil 



forth ftre travel" for wliicli the boiiei' 



is so well known. 



It's "that long tire travel that also has 



mnch to do with making the short coal 



bill." 



Hack .-ind f..rlli the hot gases Ir.ivcl. 

 until they reach the smoke box and 

 chimney with only just enough hetit 

 left in them to produce the necessary 

 draft. 



There are several other Burnham econ- 

 omies well worth mentioning, but these 

 iire the big ones— the ones to keip in 

 mind when some one tries to tell yon 

 that any other cast iron boiler can lietit 

 a greenhouse as econoniically as I bo 

 Burnham Greenhouse Boiler can. 

 Railroads are crowded with business. 

 Freights are slow. So order ahead of 

 time, if you wjint ,\onr boiler on time. 



guilders of Greenhouses and Conservatories 

 SALES OFFICES 

 NEW YORK BOSTON PHILADELPHIA 



I2nd Street BIdg. Tremont Bldg. Widener Bldg 



TORONTO. CANADA. Royal Bank Bldg. MONTREAL. Tran.portation^Bldg. 



FACTORIES: Irvington. N. Y. Des Plaines, 111. St. Catharine., Canada 



CHICAGO 

 Rookery Bldg. 



ROCHESTER 

 Granite Bldg. 



CLEVELAND 

 Swetland Bldg. 



