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according action ammonia apparatus appears arrangement ball battery becomes bodies carbon cause charge chemical chloride circuit circumstances colour combination common complete compound conducting conductor connected considerable considered contain continued copper crystals direction discharge distance effect electric employed equal examined experiments extremity fact fluid force give given glass heat hydrogen inches increased indications induction influence intensity iron kind lead length less light liquid magnetic manner matter means metallic minutes nature needle negative nitric acid nitrogen object observed obtained operation oxygen pass piece plane plate polarity pole portion positive precipitate present principle produced proportion quantity rays remains salt seen separated side silver similar single solution substances sufficient sugar sulphuric acid supposed surface takes place temperature tion transmitted whole wire zinc
Seite 91 - What would be the visual effect of simultaneously presenting to each eye, instead of the object itself, its projection on a plane surface as it appears to that eye?
Seite 383 - Calotype paper are for the most part invisible impressions. They may be made visible by the process already related, namely, by washing them with the gallo-nitrate of silver, and then warming the paper. When the paper is quite blank, as is generally the case, it is a highly curious and beautiful phenomenon to see the spontaneous commencement of the picture, first tracing out the stronger outlines, and then gradually filling up all the numerous and complicated details.
Seite 435 - DETRIMENTAL to the power of the battery: the copper plate is also covered with a coating of metallic copper, which is continually being deposited; and so perfect is the sheet of copper thus formed, that, on being stripped off, it has the polish and even a counterpart of every scratch of the plate on which it is deposited.
Seite 382 - Make a saturated solution of crystallized gallic acid in cold distilled water. The quantity dissolved is very small. Call this solution B.
Seite 384 - But the author prefers to make the copies upon photographic paper prepared in the way which he originally described in a memoir read to the Royal Society in February 1839, and which is made by washing the best writing paper, first with a weak solution of common salt, and next with a solution of nitrate of silver. Although it takes a much longer time to obtain a copy upon this paper, yet when obtained, the tints appear more harmonious and pleasing to the eye ; it requires in general from...
Seite 29 - We have, therefore, from these results, and those formerly obtained (III. 92.), the following series of directions of currents, one produced at the moment of beginning, and the other at that of ending of the battery current. At the beginning. At the ending. Primary current + + Secondary current — + Current of the third order . + — Current of the fourth order — , + Current of the fifth order ... + — 26. These two series, at first sight, may appear very different, hut, with a little attention,...
Seite 386 - ... to an ounce of distilled water ; it is quickly dried, and a second time washed with the same solution. It is then, when dry, placed for a minute in a solution of...
Seite 384 - ... more harmonious and pleasing to the eye; it requires in general from three minutes to thirty minutes of sunshine, according to circumstances, to obtain a good copy on this sort of photographic paper. The copy should be washed and dried, and the fixing process (which may be deferred to a subsequent day) is the same as that already mentioned. The copies are made by placing the picture upon the photographic paper, with a board below and a sheet of glass above, and pressing the papers into close...
Seite 117 - ... is seen at the intersection of the two lines of visible direction in which it is seen by each eye separately, whether these lines of visible direction terminate at corresponding points of the two retinae or not. But if we were to infer the converse of this, viz. that every point of an object in relief is seen by a single glance at the intersection of the lines of visible direction in which it is seen by each eye singly, we should be in error.
Seite 30 - Current of the fourth order — + Current of the fifth order + — 26. These two series, at first sight, may appear very different, but with a little attention, they will be seen to be of the same nature. If we allow that the induction at the ending of a galvanic battery should be opposite to that at the beginning of the same, then the sign at the top of the second column may be called minus instead of plus, and we shall have the second series 1 1- alternating precisely like the first.