The Repertory of arts and manufactures [afterw.] arts, manufactures and agriculture, 第 9 巻 |
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acid afcending pipe air-veſſel alkali alſo axis becauſe beſt boiling bottom calcined carbonic acid cauſe cloſe compofition confiderable confiftence conſequently conſtruction degree deſcribed diffolved diſtilled drachms evaporating experiments expoſed faid falt fame feet fermentation fide filk fimilar firſt fiſh fixed foap folution fome freſh fuch fufficient fulphate of iron galls heat inches increaſe invention itſelf laſt leſs leys liquor logwood main pipe malt manner maſs meaſure metal method moſt motion mucilage muſt neceſſary nitrous acid obſerved ounces oxide paffing paſs paſſed pounds precipitate preſents ſhall preſerve prevent proceſs proportion pump purpoſe quantity raiſed reel refervoirs repreſented reſpect rope ſaid ſalt ſame ſay ſcale ſcrew ſecond ſeparate ſeven ſeveral ſhaft ſhew ſhewn ſhips ſhould ſhut ſmall ſolutions ſome ſpace ſpindle ſpirit ſtate ſteam ſtill ſtop-valve ſtrand ſtrong ſubject ſubſtance ſuch ſuppoſed theſe thoſe tion twiſting uſed uſual valve veſſel waſhed wheel yarns
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171 ページ - I found it was, at feven feet, (for a large fwelling rendered it unfair to meafure it at five or fix feet,) a trifle above thirty-four feet in circumference ; and, in 1778, I found it had not increafed above half an inch in nineteen years. This more entire remain of longevity merits fome regard from the lovers of trees, as well as the hollow oak at Cowthorp, in Yorkfhire, which Dr. Hunter gives an account of in his edition of Evelyn's Silva, and calls it, forty-eight feet round, at three feet.
177 ページ - We may lay it down as an incontestable axiom that, in all the operations of art and nature, nothing is created ; an equal quantity of matter exists both before and after the experiment : the quality and quantity of the elements remain precisely the same, and nothing takes place beyond changes and modifications in the combinations of these elements. Upon this principle, the whole art of performing chemical experiments depends...
110 ページ - The great degree of fenfibility of this teft would leave very little reafon to fearch for any other, were there reafon to believe that it is always a teft of the exact point of faturation of acids and alkalies, which the following fact feems to call in queftion. I have obferved, that a mixture of phlogifticated nitrous acid with an alkali, will appear to be acid, by the teft of litmus, when other tefts, fuch as the infufion of the petals of the fcarlet rofe, of the blue iris, of violets, and of other...
399 ページ - I will take one acre of clover, which at one cutting will produce from fourteen to eighteen tons of green vegetable matter, and about three tons of lime; this, when...
187 ページ - Procure three earthen or wooden veflels of different fizes and apertures, one capable of holding two quarts, the other three or four, and the third five or fix : boil a quarter of a peck of malt for about eight or ten minutes in three pints of water; and, when a quart is poured...
121 ページ - ... the oil of its colour ; while the oxide, attracting the mucilage, may contribute to the fame end. How far this theory may apply to the explanation of the foregoing experiments, I do not pretend to determine, It is remarkable, however, that one of the earthy fubftances, viz.
292 ページ - Fig. 3, reprefents the diaphragms and tubes enclofed within the drum, the diaphragms being compleated by having their plates fcrewed on; in thefe plates are fixed two valves G, G. Oppofite to which are two others, one in each diaphragm, fo correfponding that at the opening of one the other is clofed, and vice verfa. Thefe valves are balanced, and held on trunnions, fo that, in every fituation of the diaphragms, they may uniformly obey the impulfe by which they are opened and fhut; the manner in which...
170 ページ - ... inches in two hundred years. But this oak cannot properly be called old. The annual increafe of very...
113 ページ - ... in a mixture of vitriolic acid and water, of about the degree of acidity of vinegar ; and it may be neutralized, as it is wanted, either by means of chalk, or of the fixed or volatile alkali. But it is...
110 ページ - ... the fame liquor to be alkaline, by turning green fo very evidently as to leave no doubt. At the time I made this difcovery, the fcarlet rofes and feveral other flowers, whofe petals change their colour by acids and alkalies, were in flower.