1390 



The Weekly Florists^ Review^ 



OcTOBEn 11, 1906. 



Greenhouse Seating. 



STEAM AND HOT VATER. 



Having a given boiler for either steam 

 or hot water, will the boiler heat more 

 cubic feet of greenhouse space, using 

 steam or hot water, and how much? 

 What changes would be necessary, chang- 

 ing from hot water to steam, besides 

 boiler trimmings? W. C. P. 



If the greenhouses are piped with 

 malleable pipes of suitable dimensions 

 for steam, a plant can be converted 

 from hot water into a steam plant by 

 installing sufficient valves to cut down 

 the radiation in the houses from a hot 

 water basis to a steam basis; i. e., if 

 steam under five to ten pounds pressure 

 is used, the houses can be heated with 

 from twenty to twenty-five per cent less 

 piping — radiating surface — than with 

 water at 180 degrees. 



To state the matter in another form, 

 twenty to twenty-five per cent more 

 glass area can be carried by a boiler on 

 a steam basis than on a hot water basis, 

 the difference being least on the high 

 temperatures and greatest on the low. 

 Unless a plant has been piped with a 

 view of converting it into a steam plant 

 it is likely that the piping will require 

 to be decidedly modified. If you will 

 describe the present plant we can soon 

 tell what changes will be necessary, if 

 any. L. C. C. 



HINTS ABOUT CHIMNEYS. 



The Herendeen Mfg. Co., in a recent 

 pamphlet, gives the following on chim- 

 ney construction: 



A chimney flue, to effect the best re- 

 sults, should be round. Next in order of 

 efficiency comes the square flue; while 

 the least effective is one of oblong form. 

 The round flue presents an amount of 

 friction surface to the smoke and escap- 

 ing gases equal to about three and one- 

 eeventh times its diameter; the square 

 flue presents four times its diameter as 

 friction surface; while the oblong flue's 

 friction surface increases, beyond that of 

 the square flue, in direct proportion to 

 the extent of elongation. As an illus- 

 tration: In an 8-inch round flue, the 

 friction surface is 25.13 inches and con- 

 tains 50.265 square inches of area. In 

 an 8-inch square flue, the friction sur- 

 face is thirty-two inches and contains 

 sixty-four square inches of area; while 

 in an oblong flue 4x16 inches, the fric- 

 tion surface is forty inches and the area 

 sixty-four square inches. 



If the square form of flue is desired, 

 the side of the square should be at least 

 equal to the diameter of the boiler 

 smoke-pipe, as the corners of the square 

 flue are of practically no value for the 

 smoke passage, and in very large flues 

 even become a detriment, in the way of 

 eddying currents which upset the true 

 course of smoke and escaping gases. In 

 other words, the sixty-four square inches 

 in the 8-inch flue are of no greater 

 value, if as great, for the smoke passage, 

 than the 50.625 square inches of the 8- 

 inch round flue. 



In an oblong flue, the depth should 

 never be less than frpm six to eight 

 inches, even for the smallest flues; and 

 the length not to exceed one and three- 

 fooTths times the depth. If an oblong 

 flue is unavoidable, better results will 



WILIS 6REENB0USE BEATEBS 



The Wilka Greenhouse Heaters 

 are all Steel Self-Feeders. 

 Will run 16 hours at a time ' 

 without attention. '/v' 



NO NIGHT FIREMAN REQUIRED 



Can be used with either 

 HARD OR SOFT COAL. 



BBVD FOB OVB VBW CATAXiOOVB. 



s. wilkFmfg. go. 



35th and Shields Avenue, 



CHICAGO, ILL. 



mo oooB, 



Mention The Kerlew when you write. 



THREE 



SUPERIOR 



BOILERS 



New, steel, each built to heat 11,000 

 feet of 4-inch pipe. 



READY FOR SHIPMENT 



SUPERIOR MACHINE 

 & BOILER WORKS 



J27-J33 West Superior St ' 

 CHICAGO, ILL. 



Mention The Keview when yuu write. 



THIS IS IT! 



THE 



MOREHEAD 

 TRAP 



Insures an even temperature 

 in your greenhouse* 



Write for particulars. 



MOREHEAD MFG. CO. 



1048 Grand River Avenue, 

 DETROIT, MICH. 



Mention The ReTlew when you write. 



be obtained if the smoke-pipe can enter 

 it on the narrow side, as this will allow 

 the smoke and escaping gases more room 

 in which to change their course from 

 the horizontal smoke-pipe to the vertical 

 flue. A flue of less than six inches of 

 depth will not allow freedom of this 

 change of direction, which directly ac- 

 counts for the unsuccessful operation of 

 boilers on shallow flues, and the conse- 

 quent condemnation of the entire system. 

 Be sure that the flue is of proper size 



riiORXNCK HXATXRS 



ODTSXDK i AKD XN8IDK 



COLUMBIA HEATII^G CO., BeMdere, III. 



Skies D«pt., 86 Dearborn St., CHICAGO 



High-Qrade Boilers 



2SS^^ For GREENHOUSES 



STEAM and HOT WATER 



6IBLIN & CO., Utica, N.Y. 



Mention The Review when yoa write. 



and shape, and that it has a gopd draft, 

 before attaching the boiler to it, for 

 many heating systems, flrst-class in other 

 respects, fail to give satisfaction merely 

 on account of poor chimney drafts. 



