The Penny Mechanic, and the Chemist, Volume 2

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1837

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Page 200 - One vessel of water rarefied by fire driveth up forty of cold water ; and a man that tends the work is but to turn two cocks, that, one vessel of water being consumed, another begins to force and refill with cold water, and so successively, the fire being tended and kept constant, which the selfsame person may likewise abundantly perform in the interim, between the necessity of turning the said cocks.
Page 200 - ... stopping and screwing up the broken end ; as also the touch-hole, and making a constant fire under it ; within twenty-four hours it burst and made a great crack.
Page 129 - There is one very unpleasing remark which every one who attends to the subject of prices will be induced to make, that the labouring classes, especially those engaged in agriculture, were better provided with the means of subsistence in the reign of Edward III. or of Henry VI. than they are at present. In the fourteenth century, Sir John Cullum observes, a harvest man had...
Page 201 - An escocheon to be placed before any of these locks, with these properties : 1. fhe owner (though a woman) may with her delicate hand vary the ways of coming to open the lock ten millions of times, beyond the knowledge of the smith that made it, or of me who invented it.
Page 125 - If we reduce in the same manner the labour expended in constructing the London and Birmingham Railway to one common denomination, the result is twenty-five thousand million cubic feet of material (reduced to the same weight as that used in constructing the Pyramid) lifted one foot high, or nine thousand two hundred and...
Page 185 - How to make a weight that cannot take up an hundred pound, and yet shall take up two hundred pound, and at the self-same distance from the centre, and so proportionably to millions of pounds.
Page 219 - ... though it work day and night, from one- end of the year to the other, it will not require forty shillings...
Page 184 - ... are rubbed, after which they are made red-hot, and then polished. The intention of this process appears to be little more than to apply the silver in a state of minute division to the clean surface of the copper, and afterwards to fix it there by fusion ; and, accordingly, this silvering may be effected by using the argentine precipitate, here mentioned, with borax or mercury, and causing it to adhere by fusion. The...
Page 200 - ... a way to make my vessels, so that they are strengthened by the force within them, and the one to fill after the other, I have seen the water run like a constant fountain-stream, forty feet high : one vessel of water, rarefied by fire, driveth up forty of cold water...
Page 177 - ... only. The relative adhesion, therefore, in the same wood, when driven transversely and longitudinally, is 100 to 78, or about 4 to 3 in dry elm; and 100 to 46, or about 2 to 1 in deal; and in like circumstances, the relative adhesion to elm and deal is as 2 or 3 to 1. The progressive depths of a sixpenny nail...

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