March 12, 1910 



horticulture: 



427 



THe Castle 

 Automatic Circulator 



The Summit of Perfection. No Device has ever been in\ented for 

 Forced Hot Water Circulation which will do what this little 

 machine accomplishes, for Economy in First Cost or in Operation. 

 Requires no Supervision or Manual Manipulation. 



Prices and Discounts on Automatic Circulator, several sizes, with 

 • or without Motors, also Testimonials from Large Greenhouse 

 Establishments, east or west, furnished on Application. 



While the method 

 of producing a forced 

 circulation of liquids 

 is the same as in the 

 Original Electric Cir- 

 culator, some modifi- 

 cations in construction 

 which we consider to 

 be of vital importance 

 are made. 



The great improve- 

 ment of its being 

 equipped with a valve 

 which requires no 

 manual manipula- 

 tion to change from 

 forced to gravity cir- 

 culation will be at 

 once recognized as 

 extremely valuable. 



" They have more than met my expectations " 



IruingUm, N. J., February .9, 1910. 

 Messrs. Win. W. Costle Co., 



170 Summer St., Boston, Mass. 

 Dear Sirs, 



Answering your inquiry loith reference to the two Automatic Circula- 

 tors furnished by you, I loould say that they have more han met my expectations. 

 While the makers of my Boilers advised me that, loith the additions I had wide, 

 I could not heat the range with the Boiler pov:er I had, I have found with the Cir- 

 culators that I have been able to maintain temperatures in the houses in the most 

 severe weather, and by their use I have made a saving of 25 per cent, in my coal 

 bills. I have found that there is but five degrees difference in temperature of the 

 flows as compared with the returns (at the Boilers) when the Circulators are 

 running. As already informed you, I have no trouble taking care of the entire 

 range, about 70,000 feet of glass, with the two Circulators. 



Very truly yours, 



(Sig^ied) E. W. FENGAR. 



The above is but one of many high commendations which we have received and 

 are constantly receiving as to the efficiency and economy of this apparatus. 



W. W. Castle Company 



170 Summer SL., Boston 



