80 



The Weekly Florists^ Review. 



Apbil 2, 1908. 







r SI QR 3 first-class and up-to- 

 *=™ date Equipment for Steam 

 Heating of a Greenhouse there 

 are two devices necessary: A 



Regulating Valve ?^ 



Back Pressure Valve. 



The two valves shown here are in use in some of the largest 

 houses in the country. Write for catalogue, prices and testimonials. 



THE JOHN DAVIS CO. ^'&JU. CHICAGO 



I 1 



1 





Mention The Rgrlew when yoo write. 



radiation to be supplied. The catalogue 

 also supplies tables showing the number 

 of square feet of radiation in pipes of 

 various sizes, the size of flow necessary 

 to care for any given number of smaller 

 radiating pipes, the velocity of flow of 

 water, the amount of expansion of 

 wrought iron pipe at several different 

 temperatures, and much other matter 

 that has to be considered in every green- 

 house installation. 



PRESSURE REGULATION. 



It has been found, by experience, that 

 in heating large ranges of greenhouses 

 by steam, it is more economical and more 

 efficient to use steam at a pressure be- 

 tween thirty and fifty pounds and reduce 

 to ten pounds or lower. This requires a 

 regulating valve that will automatically 

 control the pressure. The Eclipse valve 

 has been installed by a large number of 

 the leading growers in the vicinity of 

 Chicago and does the work satisfactorily. 

 The boiler pressure may vary, but the 

 valve maintains an even pressure on the 

 radiating pipes. In many cases the fore- 

 men use the pressure valve, instead of 

 the globe valves, as a means of regulat- 

 ing the heat in the houses: when the 

 day is warm they check down the valve 

 to reduce the pressure on the coils, and 

 when the outside temperature falls they 

 simply increase the pressure a half pound 

 at a time. This keeps the temperature of 

 the houses more uniform than would be 

 the case if part of the pipes were cut 

 out, and with less work. The more vari- 

 able the outside temperature is, the more 

 valuable this method of heating is found. 

 On page 10 of this issue are shown two 

 8 -inch pressure regulating valves, placed 



THE SUPERIOR 



Return Flue rire=Box Boiler 



This boiler 

 has given 

 better satis- 

 faction than 

 any other 

 boiler on the 

 market. 



Made In 

 8 sizes tor 

 Hot Water 



18 of these bongrlit and used by one grower 

 6 by another 



Send lor new 



Gatalogue 



and list 



of firrowerfl 



that are 



using: 



this Boiler 



Ask the man that knows; the names are yoars tor the asking of theia 



Superior Machine & Boiler Worics 



^125 W. Superior St.. CHICAGO, ILL. 



Mention The ReTlew when yon write. 



S. WILKS MFG. CO. 



Manutactnrers of 



Greenhouse Boilers 



35tli and Shields Ave.. CHICAGO, ILL 



Mention The Beview when yon write. 



in parallel steam mains at the establish- 

 ment of Bassett & Washburn, Hinsdale, 

 111., by the John Davis Co., Chicago. 

 At one side of the valves sixty pounds 

 are carried and on the other two 



Hisli-firade Boilers 



For GREENHOUSES 



Get Our 



Catalogue 



STEAM and HOT WATER 



GIBLIN & CO., Utica, N. Y. 



Mention The Rerlew when yon write. 



to ten pounds, as the weather may ri 

 quire. It is a vacuum system, and steaii 

 will circulate almost instantaneously if ' 

 half pound pressure is admitted by tli' 

 valves. 



