. Il libro del giardino. Il giardinaggio. Per mostrare l'economia della potenza meccanica in Chatsworth conservatorio da soli, Sir Joseph Paxton ci informa che, anche nella sua forma originale, l'anta-bar macchina eseguite il lavoro di venti uomini per un anno e di conseguenza risparmiato £1200. La lunghezza delle barre da essa effettuate per il conservatorio che permetterebbe di estendere verso l'alto di quaranta miglia in linea diretta, rendendo al tasso del 2000 lineal piedi di barre per giorno, e a un costo per l. La partecipazione di solo 5s. diaria • e la sua prima il costo era di soli € 20. Allegate la xilografia, fig. 786, mostra la forma di anta-bar, half-size. T

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. The book of the garden. Gardening. To show the economy of mechanical power in the Chatsworth conservatory alone, Sir Joseph Paxton informs us that, even in its original form, the sash-bar machine performed the labour of twenty men for one year, and consequently saved £1200. The length of bars made by it for that conservatory would extend upwards of forty miles in a direct line, making at the rate of 2000 lineal feet of bars per day, and at an expense for. attendance of only 5s. per diem • and its first cost was only £20. The annexed woodcut, fig. 786, shows the form of sash-bar, half size. The glass, being let into the grooves, lg*7 * requires little putty, and, when once in, is more imper- vious to rain than by the usual modes of glazing. In this case it will also be seen that the as- tragals taper both upwards and downwards from the shoulder to the groove, thus requiring very little putty. The astragal, although thin, has its strength retained by giving additional depth, upon which the principle of strength is well known chiefly to depend. The first cost of this machine is so trifling, that any one intending to build anything beyond an ordinary range of hothouses would economise the expense by the saving of manual labour. The machine could easily be attached to a saw-mill, thrashing-machine, corn-mill, or indeed wherever there is motive power on the premises. We have seen, in the establishment of A. L. Wallace, Esq. of Edinburgh, a very simple and effective machine for cutting- out mortices. It was wrought by a lever acted upon by the foot, somewhat like a turning-lathe, and is, for framed doors and sashes, an improvement which materially reduces the expense of their construction. An amazing amount of prejudice has to be got rid of before either of these machines can be brought into general use; and before the second Crystal Palace is finished, we shall see mechani- cal power applied to such purposes to a much greater extent than has as yet even been anticip

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1850
• booksubjectgardening
• bookyear18