136 



inch flow pipes, which may be fastened 

 to the purliB posts. While the actual 

 amount of radiation in the greenhouse 

 is not too great for one 2%-inch pipe 

 if the house were 200 feet in length, 

 if an attempt is made to supply twelve 

 2-inch returns in the coils, the circula- 

 tion will, at best, be sluggish in two 

 or three of the pipes at the bottom of 

 each coil. If it is possible to place a 

 coil of three 2-inch returns along one 

 side of the walk, it will be advisable 

 to arrange for a third 2i^-inch flow pipe. 

 There would then be three coils, each of 

 three 2-inch pipes. The circulation 

 would then be much better than with 

 two flow pipes. 



Nothing would e gained by using 

 coils twenty-five feet in length, and, in 

 fact, there would be about twice the 

 number of flows needed as for coils of 

 twice the length. 



The amount of radiation necessary is 

 determined largely by the area of ex- 

 posed glass. Having the walks exca- 

 vated will make little difference. 



FIGUSINa THE BADIATION. 



I expect to erect a greenhouse like the 

 one shown on the sketch sent. The house 

 will be fifty feet long. How shall I pipe 

 it and what radiation capacity will be 

 required of a hot water boiler to heat 

 the house to 50 degrees in zero weather? 

 What size boiler will be required to heat 

 to 55 degrees in weather 10 below zerot 



G. E. S.— N. J. 



The sketch shows a three-quarter span 

 house eighteen feet in width, with a wall 

 four feet high in front and six feet high 

 in the rear. The front wall has sixteen 

 inches of glass, with the remainder of 

 the walls of wood. The house has a row 

 of posts under the ridge and another 

 row under the purlin. 



To heat such a house to 55 degrees in 

 zero weather, it would be advisable to 

 use four 2-inch flow pipes, placing one 

 on each of the wall plates and one on 

 each row of purlin posts. For the re- 

 turns, either eight 2-inch or ten 1%-inch 

 pipes may be used. With this, it would 

 be well to use a boiler rated for 500 

 square feet of radiation if hard coal 

 will be burned, or one of 625 square feet 

 if soft coal is to be used. 



If the location is where the minimum 

 temperature is 10 below zero, it would 

 be well to use two additional returns and 

 to install a hot water boiler rated for 

 600 square feet for use with hard coal 

 or 750 square feet for soft coal. When 

 the outside temperature is 10 below 

 zero, a temperature of 50 degrees could 

 be maintained with the boiler and the 

 radiation first specified. The figures 

 here given are conservative, and, if the 

 house is well built and is not exposed to 

 high winds, no difl&culty should be found 

 in obtaining the temperatures men- 

 tioned. Moreover, by burning somewhat 

 more fuel and by careful attention to 

 the firing in extremely cold weather, it 

 would be possible to secure 10 degrees 

 more than the temperatures stated. 



Each must decide for himself whether 

 it will be more economical to put in a 

 plant which will, without pushing, give 

 the temperature desired, or to economize 

 in the cost of the heating plant and then 

 go to considerable expense for labor and 

 fuel whenever the mercury drops below 

 zero. The latter course is often advis- 

 able where the winters are short and the 

 extremely low temperatures are infre- 

 quent. 



The Rorists' Review 



OCTOBKR la, 1921 



When that arch burns out 



Don't Shut Down 



but while continuing to carrv your load 

 make quick temporary repairs with 



i 



FURNACE LINING 



Then as soon as opportunity offers put in a complete 

 PLIBRIOO selling— front and back arches, baffles, side 

 walls, bridite walls— and yoa will need no further 

 repairs. 



Send for our Booklet D-42 on "Modern Furnace Building." 



PLIBRICO b de- 

 liTcrtd anlir ia (tecl 

 cooUincn •( dw- 

 HactiTc appear* 

 ancc ai ikaura at 

 therifht. Ware- 

 house stocks in 

 all principal 

 cities. 



Mention The Review when you write. 



KEEP A DAILY RECORD OF TENTERATORES 



IN YOUR GREENHOUSES 



ORDER NOW 



$40.00 



STANDARD 



65 Shirley Street, 



Record s are as important in the growing business as 

 in any other business. Progressive growers who 

 scare no effort in raising highesi grade stoclc use 

 Standard Recording Thermometers and linow the 

 great aid of keeping records of tempe aiure^s. Your 

 equipment is far from complete if you have no 

 Standard Recording Thermometer. 



The actuating element of the Standi«rd Recording 

 Thermometer is of lamina metal, which, besides 

 being extremely sensitive to teoiperature changes, 

 is pr ctically indestructible. Record charts are 

 furnished either daily or weekly, and the whole 

 mechanism is contained in an attractive metal case 

 Sited with Iock and key which insures the record 

 from being tampered with. 



The clock movement is of extremely high grade; 

 everything about the instrument is up to the high- 

 est possible standard of manufacture. 



THERMOMETER 



75-19 



COMPANY 



BOSTON, MASS. 



Mention The Review when you write. 



Mfftehead 



Points the 

 Way to 

 Economy of Fuel 



m 



EGIN NOW to find out about the ■'Morehead" System. Send right away 

 for the "Morehead" book for florists. In it you will find an easily understood 

 discussion of the boiler and condensation question from the practical 

 s and point of the grower of flowers. Write for this help TODAY. 



MOREHEAD MFG. CO. 



Dept. "M" 299 



DETROIT, MICH. 



Mention The Review when yon write. 



It Lets the Florist Sleep 



Let us tell you what one 

 will cost delivered at 

 your Railroad Station. 



WRITE NOW 



You don't havo to sit up and watch a 



GIBLIN GREENHOUSE BOILER 



GIBLIN 6l CO. uncA, N.Y. 



