. Il libro del giardino. Il giardinaggio. 156 Riscaldamento COME APPLICATO IN HOETICULTURE. del suo metodo di realizzazione di giunti. Che era necessario che essi dovrebbero essere perfettamente a tenuta d'aria, è ovvio; quindi la maggiore attenzione è stata richiesta nel loro imballaggio. Noi crediamo che le sue articolazioni erano ciò che è chiamato la ruggine giunti, già notato, e consisteva semplicemente in una pasta formata di limatura di ferro o dei fori, ottenuto al ferro-opere, miscelati con sal-ammoniaca e acqua : un collare di corda di canapa filata in modo lasco viene prima intro- duced, e quando azionato in hard, la ruggine è introdotto un po' alla volta e anche impaccato duro come pos

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. The book of the garden. Gardening. 156 HEATING AS APPLIED IN HOETICULTURE. of his method of making joints. That it was necessary that they should be perfectly air-tight, is obvious; hence the more care was required in packing them. We believe that his joints were what is called rust joints, already noticed, and consisted merely of a paste formed of iron filings or borings, obtained at the iron-works, mixed with sal-ammoniac and water : a collar of hempen cord loosely spun is first intro- duced, and when driven hard in, the rust is introduced a little at a time, and also packed as hard as possible. A chemical combination takes place in a short time, and the joint not only becomes perfectly air and water tight, but is also rendered incapable of separation. Spigot-and- faucet joints are now universally used, instead of the old flange joints, which were less secure and looked ill, and were formed by covering thick millboard with white lead, and bringing the ends of the pipes together with screws and nuts. These joints are now only used in cases of altera- tions ; as, for instance, if additional pipes are to be attached to those already in use, a saddle-joint, which is a species of flange, may be employed, the heads of the bolts being within the pipes, and the nuts on the flange without. Fowler, an engineer of some eminence, shortly afterwards followed Kewley, and published a description of his thermo- siphon in the "Gardeners' Magazine." His system appears to be merely a modifica- tion of Kewley's, its peculiarity consist- ing in lengthening out the returning pipe, by which means the water would, by giving out its heat during a longer run, become much heavier and colder ; and hence, by flowing more rapidly into the boiler, would destroy the equilibrium, and consequently draw the hot water up the other leg with Fiff 165. greater rapidity. A glance at the annexed sketch, fig. 165, will show this; and also make evident how very little his system dif- fers from

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1850
• booksubjectgardening
• bookyear18