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•\: : ■ '."v,';- 



Decbmbeb 8, 1010. 



The Weekly Florists' Review* 



93 



USE THIS SIMPLE 



-AND- 



Metallic Thermometer "A** 



SiZB— 8 Inches biRrh, 4 inches wide, 2 inches deep. 

 Oaae made of cast aluminum, highly finished. 



Save Your Stock 



From Destruction 



By a sudden cold snap or a rapid thaw 



U OIJ^? Because it ia an accurate, fully tested thermometer, show- 

 ■■^^ " * ing the correct temperature at all times, and combines 

 a device which will ringp a bell at your bedside when the 

 C^eenhouse gets either too hot or too cold. Just the protection 

 you have wanted all these years. 



We guarantee that results will be obtained at all times. This device 

 has been subjected to the severest tests in our laboratory for over two 

 years, and at the same time haa given entire satisfaction, under all con- 

 ditions, to many users in the trade. 



All you have to do is to set the pointers at the highest and lowest 

 temperatures you want and the thermometer will do the rest. It will 

 ring a good, loud bell when either point is reached, and saves all worry 

 over trouble from sudden temperature changes. 



INVESTIGATE IT TODAY 



i§ss#""i?ThS^T5S^ loss savers yod need 



National Clock & Electric Hfg. Co.,st loms, Nissoiui 



Mention The Roview wh' ti ynii' write. 



lation will be more rapid when the 

 water is under pressure, owing to the 

 fact that the water is hotter. Hot water 

 is lighter than cold water, and the cir- 

 culation in a hot water system is due 

 to the difference in the weight of the 

 cooled water in the returns and that 

 of the hot water in the flow pipes. The 

 former, being the heavier, pushes the 

 light, hot water from the boiler out 

 into the flow pipes and around into the 

 coils, where, as it cools, its increased 

 weight tends to keep up the circulation, 

 which is still further maintained and 

 accelerated by the heating of the cold 

 water which has forced its way into the 

 boiler. 



In theory it is -best to have a single 

 flow pipe lead to the highest point of 

 the system, and this should be as near 

 the heater as is convenient, so that the 

 water in the flow can be kept as hot 

 as possible, while the returns should 

 be smaller, in order to hasten the cool- 

 ing. The reduction in the size of the 

 returns will, of course, be limited by 

 the increased friction in small pipes, 

 but it is possible to use smaller returns 

 when running under pressure than with 

 an open system. 



While the cost of installing a closed 

 system may be less, the amount of fuel 

 required will be greater. 



INSUFFICIENT EADIATION. 



I have one small greenhouse, with side 

 walls three feet high, double boarded. 

 The house runs east and west and ad- 

 joins the woodshed. I have an upright 

 hot water boiler, standing in a pit in 

 the woodshed. The outlet starts with a 



GREENHOUSE HEATING 



is a perplexing anestlon to all florists EXCEPT those nsinK 



MOREHEAD STEAM TRAPS 



Q The installation of a Morehead Return Steam Trap in a 

 ^ Greenhouse is absolute evidence of progressiveness on the 

 part of the florist. 



It is further evidence of good management, for the " More- 

 VipaH " is an investment m both satisfaction and economy. 



head' 



The majority of florists are using Morehead Traps 



are one of the exceptions, it will be to your 



interest to write us — we will make you a 



liberal trial offer proposition. 



By \7ay of Ketting acquainted, lust send your 

 name and address and ask for "Trap Book. ' ' 



oreheod Mfg. Co. 



If you 



Dept. M 



DETROIT, MICH. 



Mention The Review when you write. 



No lost from sudden drops in 

 temperature if you use the 



SacM^estors to the 

 Joh« Davis Company 



Hughson Regulating Valve 



In connection with a steam heating plant. Carry 40 or 

 50 pounds pressure on the boiler and set the valve for 5 

 or 10 pounds— it will do the rest. You'll be free from 

 worry this winter, if you follow this advice : " Install a 

 Huffbson ResruIatlnK Valve when making your 

 repairs." Ask for our Catalogue, which also shows 

 Steam Traps and other devices. 



HUGHSON STEAM SPECIALTY CO. 



'' 5021-5023 S. State St., CHICAGO, ILL. 



Mention The Review wben you write. 



