The Technical repository, by T. Gill, Volume 3

Front Cover
Thomas Gill (patent-agent)
1823
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Page 131 - ... and oak are the sorts of wood commonly made use of in Italy for this purpose. The painting should be very highly finished; otherwise, when varnished, 'the tints will not appear united. " When the painting is quite dry, with rather a hard brush, passing it one way. varnish it with white wax, which is put into an earthen...
Page 414 - Paris pound, fioids de marc of Charlemagne, contains 9216 Paris grains; it is divided into 16 ounces, each ounce into 8 gros, and each gros into 72 grains. It is equal to 7561 English troy grains. The English troy pound of 12 ounces contains 5760 English troy grains, and is equal to 7021 Paris grains.
Page 232 - The process for obtaining the sugar is thus conducted. The juice or liquor runs from the receiver to the boilinghouse, along a wooden gutter lined with lead. In the boiling-house it is received (according to the modern improved system, which almost universally prevails in Jamaica) into one; of the copper pans or cauldrons, called elarifiers : of these there are commonly three, and their dimensions are generally determined by the power of supplying them with liquor.
Page 207 - One drachm of sulphate of copper is dissolved in an ounce of distilled water, to which is added half an ounce of a saturated solution of bichromate of potash; this solution is applied to the surface of the paper, and, when dry, it is fit for use, and may be kept for any length of time without spoiling. When exposed to sunshine, the first change is to a dull brown, and if checked in this stage of the process we get a...
Page 379 - ... chlorine, and consequently of muriatic acid, of delicacy equal to the foregoing. If any matter containing chlorine or muriatic acid is laid on silver in a drop of solution of yellow sulphate of iron, or of common sulphate of copper, a spot of a black chloride of silver, whose colour is independent of light, and which has not been attended to by chemists, is produced. The chlorine in a tear, in saliva, even in milk, may be thus made evident. When the quantity of chlorine in a liquor is very small,...
Page 389 - ... of a size somewhat smaller than the paper, turn up the edges of the paper, and paste them on the back of the slate, and then allow the paper to dry gradually. Wet, as before, three more sheets of the same kind of paper, and paste them on the others, one at a time ; cut off with a knife what projects beyond the edges of the slate, and when the whole has become...
Page 301 - This engine, a section of which, on a scale of a quarter of an inch to a foot, is shewn in pi.
Page 220 - It is certain you never see a branchy cane here. In January and February, the canes begin to be ready to cut, which is about nine months from the time of planting. This operation is the same as in other sugar countries : of course, I need not describe it. Their height, when standing in the field, will be from eight to ten feet (foliage included) ; and the naked cane, from an inch, to an inch and a quarter in diameter.
Page 133 - ... dissolved, add eight ounces of white wax. Put the earthen vessel with the gum-water and wax upon a slow fire, and stir them till the wax is dissolved and has boiled a few minutes : then take them off the fire and throw them into a basin, as by remaining in the hot earthen vessel the wax would become rather hard ; beat the gum-water and wax till quite cold. As there is but a small proportion of water in comparison to the quantity of gum and wax, it would be necessary in mixing this composition...
Page 133 - ... prepared as mentioned in the first part of this receipt: before it is put on the fire, and •when sufficiently boiled and beaten, and is a little cold, stir in by degrees twelve ounces, or three quarters of a pint (wine measure) of cold spring water, and afterwards strain it.

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