78 



The Florists^ Review 



Januaby 7, 1915. 



r|N.H. LINCAWEAYER&CO.Jnc. 



ANTHRACITE 

 BITUMINOUS 



COAL 



West End Trust Buildinc. PHILADBLPHIA 



1 Bnwkdway. NBW YORK 



■uttins Buildins. LEBANON. PA, 



Mention The Rerlew when yon write. 



Greenhouse Heating. 



ATTACHINQ A OENEEATOR. 



The general accuracy and helpfulness 

 of the suggestions given in The Ke- 

 view's Heating Department are suffi- 

 ciently indicated by the frequent Re- 

 ceipt, at The Review's office, of letters 

 containing such statements as this: "A 

 year ago we rearranged the piping in 

 our greenhouses in accordance with in- 

 structions receWed from your paper, 

 and the results' were so satisfactory 

 that we are now coming to you for di- 

 rections about the installation of the 

 heating system in our new house." 

 However, a query and reply published 

 in the issue of December 10, 1914, 

 under the title, "Attaching a Genera- 

 tor," was considered objectionable by 

 some of the generator manufacturers, 

 as not doing full justice to their appa- 

 ratus; 80 two of the firms sent in good- 

 natured protests. The Review, of 

 course, would greatly dislike to create 

 any impression that would be in the 

 least unfair to the manufacturers or 

 misleading to those who ask for infor- 

 mation. Therefore, in order to do jus- 

 tice to all concerned and throw as 

 much light on the subject as possible, 

 the question about the generator is here 

 reprinted; then follows the reply which 

 aroused the objections; next come the 

 letters of the two objectors, and these, 

 again, §^e followed by a second reply 

 from The Review 's expert, written after 

 the protests had been submitted to him. 

 fe 



We are heating a greenhouse, 28x100, 

 by the overhead, downhill hot water 

 system, with a pipe running to the 

 expansion tank from a 4-inch main di- 

 rectly over the boiler. The top of the 

 main is only about eight inches below 

 the bottom of the expansion tank. Now 

 I wish to attach a mercury generator, 

 and of course I shall be unable to 

 locate the generator between the top 

 of the main and the bottom of the tank. 

 Will good results follow if the generator 

 is located at some point below where 

 the expansion pipe is connected with 

 the main! A. B. R. 



In order to secure any benefit from a 

 generator, it must be used in connection 

 with a closed system, as a generator 

 really is nothing more than a safety 

 valve and vacuum valve combined. 

 Hence, unless the expansion tank can 

 be put under pressure, no effect will 

 be secured from the generator. How- 

 ever, the generator can be attached to 

 the system, either on the flow or on 

 the return pipe, provided the expansion 

 tank is removed and an air valve is 

 inserted at the highest part of the main. 

 This, however, might cause trouble, 

 since air might collect in the main and 

 hinder the circulation. To correct this 

 difficulty, unless the expansion tank now 

 in use is capable of being put under a 

 pressure of 100 pounds, I would suggest 

 that it be replaced with a small, riveted 



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steel tank, with a water column on the 

 side and an air valve in the top. With 

 a reasonable amount of attention, the 

 main can then be kept free from air, 

 and by using the circulator the water 

 can be carried under pressure. 



We have just noticed your reply to 

 A. B. E. in the December 10 number 

 of The Review. Your correspondent 

 asked a simple question and your reply 

 may mislead him. 



In the first place, a mercury genera- 

 tor is to be used on an open expan- 

 sion tank and never a closed one, as 

 you have stated. The expansion tank 

 can be made of the lightest tin, so far 

 as the working of the generator is con- 

 cerned, M'ith its top entirely open, or it 



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can be of the usual type of tank, with a 

 1-inch overflow and open and free to 

 the atmosphere. 



The generator is attached to the ex- 

 pansion pipe at some point between the 

 bottom of the expansion tank and 

 where the expansion pipe joins the 

 heating system. It is best practice to 

 take the expansion pipe from an over- 

 head main near the boiler and drop 

 down to the generator, which should 



