The Penny Mechanic, and the Chemist, Volume 21837 |
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Page 20
... present the reader with a mass of miscellaneous information rela- tive to my present subject , which I need scarcely say is condensed from various sources . Coals were first used in common in the reign of Edward I .; previously wood was ...
... present the reader with a mass of miscellaneous information rela- tive to my present subject , which I need scarcely say is condensed from various sources . Coals were first used in common in the reign of Edward I .; previously wood was ...
Page 28
... present position the transverse section of the soil to be of such a nature as to require a slope of 2 to 1 ; then AC must be equal to twice BC , and similarly 2 D E = EF ; then obviously ACEF is the total width of the base of the ...
... present position the transverse section of the soil to be of such a nature as to require a slope of 2 to 1 ; then AC must be equal to twice BC , and similarly 2 D E = EF ; then obviously ACEF is the total width of the base of the ...
Page 30
... present calculation for doing the work . If these horses he taken at 207. or 301. per horse , or say 25. , it will amount to 2,500l . Three steam - carriages will do the same work , and the expense of these will be about 5007. each , or ...
... present calculation for doing the work . If these horses he taken at 207. or 301. per horse , or say 25. , it will amount to 2,500l . Three steam - carriages will do the same work , and the expense of these will be about 5007. each , or ...
Page 34
... present position , with a counter - balancing weight on its longer arm , will prevent the weight from running down , the shorter arm of the lever projecting through one of the links of the chain supporting the weight . The action of ...
... present position , with a counter - balancing weight on its longer arm , will prevent the weight from running down , the shorter arm of the lever projecting through one of the links of the chain supporting the weight . The action of ...
Page 44
... present day . they remained little better than statu quo . Many of your readers may , perhaps , re- collect whole strings of pack horses wend- ing their weary way from town to town , the leading horse selecting the firmest and most even ...
... present day . they remained little better than statu quo . Many of your readers may , perhaps , re- collect whole strings of pack horses wend- ing their weary way from town to town , the leading horse selecting the firmest and most even ...
Expressions et termes fréquents
acid Aldersgate Aldersgate Street ammonia answer antimony apparatus appear applied balloon Birmingham bismuth boiler carbonic carbonic acid carriage cause centre chlorine City Press Colosseum colour common copper correspondents crank cylinder D. A. DOUDNEY diameter drachms Editor effect eight o'clock electricity engine equal experiments feet fire force glass half half-past eight heat Holywell-street hydrogen inches inclined plane inform invention iron Islington lever light Literary and Scientific London Long Lane machine magnet means Mechanic and Chemist ment mercury metal method miles motion muriate Mutual Instruction Society nerally nitric acid obtained ounces oxygen Pancras Literary paper pass Penny Mechanic perpetual motion piece pounds present pressure produced quantity QUERIES Railway readers road Scientific Institution side Sir,-Can solution Southampton steam stone substance sulphuric sulphuric acid surface tion tube turpentine vessel weight wheel wire wood zinc
Fréquemment cités
Page 202 - 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 202 - ... 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 203 - 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 187 - 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 221 - ... though it work day and night, from one- end of the year to the other, it will not require forty shillings...
Page 186 - ... 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 202 - ... 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 179 - ... 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...