. The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general. screwed. Tliis is left open except inextremely cold weather, when a safetyvalve is put in to be again removed whenthe weather moderates. The reason forapplying the safety valve is obvious, butwhy take it off again. If allowed to re-main in its place during warm weather,it would do neither good nor harm, butwould be already placed for the nextcoldsnap. Itwould be^interestingto hearwhat effect the removal of the safetyvalve is supposed to have. The above has been written
. The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general. screwed. Tliis is left open except inextremely cold weather, when a safetyvalve is put in to be again removed whenthe weather moderates. The reason forapplying the safety valve is obvious, butwhy take it off again. If allowed to re-main in its place during warm weather,it would do neither good nor harm, butwould be already placed for the nextcoldsnap. Itwould be^interestingto hearwhat effect the removal of the safetyvalve is supposed to have. The above has been written to explainmy conviction, based on experience anda knowledge of the principles involved,that having piping designed for an opensystem with a head of 20 feet, more orless, it is better to close the system anduse a permanent pressure of UO pounds,or more. Thismightnecessitate a changein the type of heater used, but after hav-ing received a few inquiries for them, nomaker would hesitateto furnish a heaterguaranteed to stand 300 pounds pres-sure. That is supposing he knows hisbusiness. Geo. A. Bates. Highwood, N. .
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
