A Journal of Natural Philosophy, Chemistry and the Arts, المجلد 5G. G. and J. Robinson, 1802 |
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
acetous acid action æther afcertain affinity alfo alkali alſo ammonia appears atmoſphere barytes baſe becauſe cafe caloric camphor carbonic acid cauſe circumftance coheſion colour combination confequence confiderable confifts conftruction cornea cryftallization decompofed decompofition diameter diffolved diſtance effect elaſtic elective affinity electricity electrometer eſtabliſhed evaporation experiments falt fame faturation fecond feems feparation fhall fhew fhould fide filver fimilar fince firſt fluid fmall foda folid folubility folution fome formed ftate fubftances fubject fuch fufficient fulphate fulphurets fulphuric acid fuppofed furface Gadolinite glaſs heat hidrogen inches increaſe inftrument itſelf lefs lens likewife meaſures mercury metallic moſt motion muriatic acid muſt neceffary nitric acid nitrous oxide obferved occafion oxigen particles Plate pot-afh precipitate prefent preffure procefs produced proportion purpoſe quantity reaſon refpect refraction refult reprefented ſcale ſeparated ſmall ſome ſtate ſubſtances tartareous acid temperature thefe theſe thofe thoſe tube uſed veffel vibrations wire
مقاطع مشهورة
الصفحة 328 - We see, moreover, in the first experiment, that the zinc, without contact of any other metal, has the power of decomposing water; and we can have no reason to suppose that the contact of the silver produces any new power, but that it serves merely as a conductor of electricity, and thereby occasions the formation of hydrogen gas.
الصفحة 304 - On this layer of balls fire is to be kindled, and in filling the grate, more balls are to be added with the coals, care being taken to mix the coals and balls well together in due proportions. If this is done, the fire will not only be very beautiful, but will send off a much greater quantity of radiant heat into the room than without them.
الصفحة 281 - WOLLASTON'S eye has a larger field of view, both vertically and horizontally, but nearly in the same proportions, except that it extends further upwards. It is well known, that the retina advances further forwards towards the internal angle of the eye, than towards the external angle ; but upwards and downwards its extent is nearly equal, and is indeed every way greater than the limits of the field of view, even if allowance is made for the refraction of the cornea only. The sensible portion seems...
الصفحة 80 - If a smaller elastic body strike against a larger one, it is well known that the smaller is reflected more or less powerfully, according to the difference of their magnitudes: thus, there is always a reflection when the rays of light pass from a rarer to a denser stratum of ether; and frequently an echo when a sound strikes against a cloud. A greater body, striking a smaller one, propels it, without losing all its motion: thus, the particles of a denser stratum of ether do not impart the whole of...
الصفحة 166 - As the gas is abforbed, the folution becomes of a deep olive brown, and when the impregnation is completed it appears opaque and almoft :black. The procefs is apparently owing to a fimple elective attraction ; in no cafe is the gas decompofed ; and under the exhaufted receiver it aflumes.
الصفحة 329 - Having procured a small wire of fine gold, and given it as fine a point as I could, I inserted it into a capillary glass tube; and, after heating the tube, so as to make it adhere to the point and cover it in every part, I gradually ground it down, till, with a pocket lens, I could discern that the point of the gold was exposed.
الصفحة 157 - We are sorry to see this, because we have great expectations from the labours of this gentleman in the field of harmonics, and his late work is rich in refined and valuable matter. We presume humbly to recommend to him attention to his own admonitions to a very young and ingenious gentleman, who, he thinks, proceeded too far in animadverting on the writings of Newton, Barrow, and other eminent mathematicians.
الصفحة 255 - On the whole, it is probable that the refractive power of the centre of the human crystalline, in its living state, is to that of water nearly as 18 to 17; that the water imbibed after death, reduces it to the ratio of 21 to 20; but that, on account of the unequable density of the lens, its effect in the eye is equivalent to a refraction of 14, to 13 for its whole size.
الصفحة 167 - Spain, we fhall find ftrong reafons for concluding, that the .atmofphere, in. all places expofed to the influence of the winds, contains very nearly the fame proportions of oxygen and nitrogen : a circumftance of great importance ; for, by teaching us that the different degrees of falubrity of air do not depend upon differences in the quantities of its principal...
الصفحة 329 - I coated the middle of it, for 2 or 3 inches, with sealingwax, and, by cutting through in the middle of the wax, exposed a section of the wire. The two coated extremities of the wire, thus divided, were immersed in a solution of sulphate of copper, placed in an electric circuit between the two conductors ; and sparks, taken at ^ of an inch distance, were passed by means of them through the solution.