The Technical repository, by T. Gill, Band 5Thomas Gill (patent-agent) 1824 |
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Seite 1 - Now know ye, that in compliance with the said proviso, I, the said Arthur Howe Holdsworth, do hereby declare that the nature of my said invention, and the manner in which the same is to be performed, are particularly tiescribed and ascertained in and by the following description thereof, reference being had to the drawing hereunto annexed, and to the figures and letters marked thereon...
Seite 431 - Middlesex, mechanist, in consequence of a communication made to him by a certain foreigner residing abroad...
Seite 144 - Manufacturer, in consequence of a Communication made to him by a certain Foreigner residing abroad, and discoveries by himself...
Seite 255 - ... about three inches, when well immersed and stirred about therein. The feathers when thoroughly moistened will sink down, and should remain in the limewater three or four days ; after which the foul liquor should be separated from them by laying them in a sieve. The feathers should be afterwards well washed in clean water, and dried upon nets, the meshes of which may be about the fineness of cabbage-nets.
Seite 92 - If this is rightly managed, the two liquids will not mix. Then place the tube in a horizontal position, and gently turn it round with the finger and thumb. The ether will very soon be impregnated with the platinum or gold, which may be known by its change of colour.
Seite 399 - Ibs. of molasses, which has been previously made tolerably hot ; stir the composition well together, in the water-bath, over the fire, but without suffering it to boil. After being thus exposed to the heat for half an hour, and frequently well stirred, it should be withdrawn from over the fire, and allowed to cool for a short time, previous to pouring it into a cylindrical mould, made of tin, tinned sheet-iron, or copper, having a wooden cylinder previously supported in the centre, by means of its...
Seite 102 - ... that surface uppermost which is to form the cast, and being banked up by sand in order that it may be perfectly supported. It is then, by means of a broad camelhair brush, to be covered over with a thin coating of wax and burgundy pitch, rendered fluid by heat.
Seite 248 - Mr. Bevan observes, that the theoretical investigation, points out an equality of resistance to the entrance and extraction of a nail, supposing the thickness to be invariable ; but as the general shape of nails is tapering towards the points, the resistance of entrance necessarily becomes greater than that of extraction ; in some experiments he found the ratio to be about 6 to 5.
Seite 92 - The process answers equally well for either gold or platina. Dissolve any quantity of gold or platina in nitro-muriatic acid, (aqua regia,) until no further effervescence is occasioned by the application of heat. Evaporate the solution of gold or platina, thus formed, to dryness, in a gentle heat, (it will then be freed from all excess of acid, which is essential,) and re-dissolve the dry mass in as little water as possible: next take an instrument which is used by chemists for dropping liquids,...
Seite 4 - Saussure's process with supports of splinters of sapphire, which process, he observes, "has been scarcely at all employed; owing partly to the excessive difficulty, in general, of making the particles adhere, and in consequence of the almost unpossessed degree of patience required, and of the time consumed by nearly interminable failures.