98 



The Weekly Florists^ Review. 



Februaby 22, 1912. 



IMPROVED RETURN TUBULAR 

 FIREBOX BOILER 



Johnston Heating Co. 



131 E. 26th St., New York City 



Mention The Review when you ;▼«!» 



possible to maintain a temperature of 

 50 degrees, when the weather is at zero, 

 by the use of one 2i/^-inch flow, carried 

 on the downhill plan, and six 2-inch re- 

 turns. If there is glass in both walls, 

 use an additional return for each foot 

 of glass, and if a temperature of 60 

 degrees is desired, use two or three 

 additional 2-inch returns. 



ABOUT AIR VALVES. 



I recently wrote to you asking for 

 some advice about the heating of my 

 greenhouse, 22i/l>xl50, with hot water, 

 and my inquiry was satisfactorily an- 

 swered in The Eeview of February 15. 

 However, there are one or two ques- 

 tions that I neglected to ask. Where 

 shall I put the air valves? Will the 

 lower end of the flows need an air 

 valve? Can 4 use automatic air valves 

 to take care of the air? J. G. 



If the flows run downhill and the ex- 

 pansion tank is connected at the high- 

 est point of the flow pipe, there will 

 be" no occasion for any air valves in 

 the system, either on the flows or re- 

 turns, as the air can escape through the 

 pipe which leads to the expansion tank. 

 There will then be no possibility of air 

 collecting at any time in the pipes, pro- 

 vided, of course, they have been given a 

 slight downward trend. 



IN EASTERN PENNSYLVANIA. 



Will you please tell me how to pipe a 

 greenhouse, 39 x 150 feet, six feet high 

 to the gutters and fourteen feet to the 

 ridge? How deep should the boiler be 

 placed in the ground? The outside tem- 

 perature here sometimes drops below 

 zero, but not often. M. H. H. 



If a house 39 x 150 feet is to be 

 heated to 50 degrees in zero weather, 

 it will be well to use five 2 1/^ -inch or 

 three 3-inch pipes as flows, and thir- 

 teen 2-inch returns. Place one of the 

 flows about four feet under the ridge 

 and one upon each of the plates. If 

 five are used, one can be carried 

 under the upper row of purlins, 

 or on the purlin posts if there are any. 

 For a temperature of 60 degrees use 

 from eighteen to twenty returns, and 

 add one return for each foot of glass in 

 the walls. 



The letter does not indicate whether 



An 



Asset In the 



Greenhouse 



Heating System 



RETURN TRAPS 



are machines from start to finish. 

 Built with as much care as would 

 be given the finest engine. 



Simple in desisrn and construc- 

 tion. Air and steam valves are in 

 the same cast iron body. 



A shock absorber receives the 

 full weight of water as the trap 

 tilts, eliminating stress, "smash 

 -^^^^—^^^^———^^^—^——^^•^■^^^-^^ and bang," usual with the ordi- 

 nary tilting trap. 



The lap welded steel tank is tested to 300 pounds pressure before shipment. 

 " Detroit " Traps are an investment— not an expense. 



Bulletin No. 326- WF, mailed upon request. 



American Blower Gompany 



DETROIT. MICH. ' 



U. S. A. 



A Steady 

 Pressure 



will always 

 be main- 

 tained in 

 your steam pipes, no matter 

 now the pressure at the boiler 

 fluctuates, if you equip your 

 main lines with these valves. 

 Carry 40 or 50 pounds pressure 

 on the boiler, set the 



Hughson 

 Regulating Valve 



to carry 5 or 10 pounds on the 

 line and you will always have a 

 reserve in case of a sudden drop 

 in temperature. This valve 

 saves both fuel and worry. Ask 

 for catalogue and particulars. 



Hughson Steam Specialty Ca. 

 5021-3 S. State St., Ckicagt 



lie«uoD The Keview when yea write. 

 DO TOU KNOW ABOUT THX 



Martin Rocking Grate 



IT SAVES COAL 



MARTIN GRATE CO., 



848 8. Dearbora St. 

 CHICAGO. 



beds or benches are used, or how they 

 are located; hence no definite advice 

 upon the location of the returns can be 

 given. Whenever possible, it is desir- 

 able to have two or three of the returns 

 upon each of the side walls and the 

 others distributed beneath the benches. 



What's This? 



IT'S THE NEW 



PERFECTION 



FLUE GLEANER 



and we want to send it to you for 

 80 days* FREE trial. 



The Perfection will clean welded 

 flues as well as old ones; remove 

 scale from tubes without cutting 

 metal ; clean hot or cold flues with- 

 out changing temper ; can be oper- 

 ated by flexible handle. 



The knives are always sharp. 

 Heads are drop steel forfiafs. 

 Huadreds bow ia use by florists. 



ScoDy Steel & Iron Co. 



AtUnidAK.ud 24tkSt.,CUci{i,III. 



Mention The Review when vou write. 



If possible, the top of the boiler should 

 be lower than the returns, but if this 

 can not be arranged it will be well to 

 attach a mercury circulator to the sys- 

 tem and thus assist the circulation. 



