Transactions of the Royal Scottish Society of Arts, Volume 1

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Neill & Company, 1841
Vol. 1- includes the proceedings of the society.
 

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Page 20 - Sketch of the civil engineering of North America ; comprising remarks on the harbours, river and lake navigation, lighthouses, steam-navigation, water-works, canals, roads, railways, bridges, and other works in that country.
Page 337 - The portion covered by the object retains the original bright yellow tint which it had before exposure, and the object is thus represented yellow upon an orange ground, there being several gradations of shade, or tint, according to the greater or less degree of transparency in the different parts of the object. " In this state, of course, the drawing, though very beautiful, is evanescent. To fix it, all that is required is careful immersion in water, when it will be found that those portions of the...
Page 481 - GH is subjected to a pressure in the direction of the tangent to the curve at the point D ; the under surface KI to a pressure upwards in the direction of the curve at the point E.
Page 14 - In witness whereof we have ordered the seal appointed by the Treaty of Union to be kept and used in Scotland in place of the Great Seal thereof to be appended to these presents.
Page 332 - ... represented by a half-tinted blot, through which the foot of the gentleman was partially visible. There can be no doubt that, when M. Daguerre's process is known to the public, it will be immediately applied to numberless useful purposes, as, by means of it, accurate views of architecture, machinery, &c., may be taken, which, being transferred to copper or to stone, may be disseminated at a cheap rate ; and useful books on many subjects may be got up with copious illustrations, which are now...
Page 438 - ... as all that is essential, is that a current of the mixed gas and air shall rise through wire cloth, and that the proportion of gas to atmospheric air shall never be so great as to allow of the flame becoming yellow, as with this precaution, the combustion of the carburetted hydrogen will be complete, and no deposit of soot will take place on cold bodies when set over the flames. The proper quantity of gas in the mixture is easily determined by the stop cock belonging to each stove. For ordinary...
Page 331 - It is difficult to express intelligibly a reason for the charm •which is felt in beholding these pictures ; but I think it must arise in some measure from finding that so much of the effect which we attribute to colour, is preserved in the picture, although it consists only in light and shade ; these, however, are given with such accuracy, that in consequence of different materials reflecting light differently, it is easy to recognise those of which the different objects in the group are formed....
Page 337 - This action appears to consist in the disengagement of free chromic acid, which is of a deep red colour, and which seems to combine with the paper. This is rendered more probable from the circumstance, that the neutral chromate exhibits no similar change. The best mode of preparing paper with bichromate of potash is to use a saturated solution of that salt ; soak the paper well in it, and then dry it rapidly at a brisk fire, excluding it from daylight. Paper thus prepared acquires a deep orange tint...
Page 245 - To make the first approximation to the shape of the lens, an iron cylinder was fitted on the moveable axis, and its surface was primed with diamond. The lathe-spindle being still, this iron cylinder was brought over the glass, so as to cut part of a cylindroid surface, whose base was nearly the required curve ; the lathe-spindle then being moved a division round, another surface was cut, and this was continued all round ; as soon as a sufficient approximation was made, both spindles were set to revolve...
Page 14 - WE do hereby, for Us, our Heirs, and Successors, grant and declare, That these our Letters Patent, or the enrolment or exemplification thereof, shall be in and by all things valid and effectual in Law according to the true intent and meaning of the same, and shall be construed...

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