A strong liquid glue, that will keep for years without changing, may be made by placing in a glazed vessel a quart of water and about 3 lbs. of hard glue. This is to be melted over a gentle fire in a glue-pot and stirred up occasionally. When all the glue is melted, drop in gradually a small quantity of nitric acid, when effervescence will take place. The vessel is then to be taken off the fire and allowed to cool. Liquidglue made in this manner hils been kept for more than two years in an uncorked bottle without any change. It will be useful for many trades, wbere a strong glue is required, without the trouble ot melting. A German chemist has discovered that there is sugar in tears. What a lump 01 sweetness, then, Niobe must have been, who was “all tears !” Pity some married men could not contrive to distil this sweetness; their wives would supply them with the «' Tery best moist all the year round." A grindstone 4J feet in diameter, in the foundry of J. L. Haven&Co., at Cincinnatti, burst on the 15th inst., doing !TIore or less injury to three Germans at work in the room. The St. Lawrence Mining Company has called for the last instalment on its stock, payable fifty cents on each share on the 30th inst., and fifty cents on the 31st of December. Improved Method of Dyeing and Bleaching The annexed engravings illustrate a new ibr®acb,A, leading into the top proeess for bleaching ' and dyeing cotton and This gauge serves to show tbe pressure (fig. linen goods, invented by C. H. Metz, of Hei delberg, in Baden, Germany; it has recently been patented in France (being illustrated in the “ Genie Industriel,” from which we have translated this, and all the important countries in Europe. The nature of the process consists in expelling all tbe air irom the cotton goods or yarn, in an air-tight vessel, then the dyeing and bleacbing liquid is allowed to flow through all the pores of the cotton, by bydraulic pressure, by which means cold liquors are made to answer as well as hot liquors, wbich are now employed in dyeing, and bleaching will be accomplished in much quicker time. Tig. 1 is a vertical section of the apparatus. Fig. is a side elevation of the same; fig. 3 is a sectional view of the spring gauge for in- dica ting the pressure. The same lettttrs refer to like parts. The apparatus, as may be seen from fig. 1, consists of two vessels joined together on a cast-iron plate. In one of them, A, is placed the cotton to be dyed, and is merely a cylinder of sheet tin, or, preferably, of copper, firmly closed at the upper part by a lid, d, which is kept tight by the hand screw, I. The plate on wbich this vessel is fixed has several apertures, 0, for the liquid to pass through, and is covered with a thin sheet of copper, 0, every where perforated. A space is left between tbese two, the latter being supported on a circular rim and projection, g, and can be also taken up when required by means of the handle, p. The other vessel, B, which is smaller, is entirely open at the top, and has fixed on to it a pump, P, of which the piston can be worked by hand or by any other movement. This pump is intended to draw up the liquid contained in the open vessel, B, and to send it by the pipe, n, into the closed vessel, A; it is constructed in a similar manner to the injection pumps of hydraulic presses, and has at its base a pipe, the end of which is perforated to allow no extraneous substance to pass, and a safety-valve, x, as well as two other valves. At the upper part of the closed vessel is the pipe, f, which forms one of the branches of a spring gauge, H ; another 3) , it contains a conical valve, a', surmounted by a piston, c', which passes through a socket, d, and has a circular base, e', to receive the pressure of the springf. A screw cap, 6'. closes the top of tbe gauge, leaving in its centre the necessary aperture for the vertical rod, l'. This rod, which forms part of the piston, c' is graduated at tbe upper part to show, in atmospheres, the degree of pressure existing in the apparatus when at work. From this arrangement it is easy to be understood that if, after having filled the vessel, A, with cotton on the one hand, and having placed in the vessel, B, on the other, a suitable quantity of water the pump, P, be put in motion, it will force the liquid from the open vessel, B, into the closed vessel, A, through the perforations in the false bottom, C. Consequently the air contained in the fibres of the cotton being driven up by the liquid, rushes through the tube, f, into the gauge chamber. The gauge, therefore, serves at once as a regulator and indicator, because it only allows the liquid to go out when tbere is it sufficient pressure greater than that of the spring to open the valve (fig. 3\. The liquid returns into the open vessel, B, by the pipe, h, the extremity of which does not extend quite to the surface of the water; it follows that the air wbich is expelled escapes upward, and the water can be again pumped into the closed vessel. There is a faucet, i' at the end of the indicator below the valve, to draw off any superfluous water, and another, u, at the end of the vessel, A, for inserting a manometer when required. There is also a faucet at the bottom of each vessel, for the purpose of emptying them. In figure 1, a common hydrostatic pump is shown, with its weighted valve, S, and all the other parts. It is an invention for Bleach and Dye Works, more especially the latter, and is much better for the coloring of cotton in the wool, than in yarn or cloth. The valve, II, as it is acted upon by the compressed air, is lifted up until the air passes by the slots into the chamber, g', which allows it to pass offthrough the bent tube, h, as shown in fig. 1. This apparatus is presented for more than one i t : it is capable of being med to impregnate skins with tannin liquor, or it can be employed for impregnating hams, &c., with salt brine; or it can be employed on a large scale lor extracting air from timber, and impregnating it with the sulphate of copper to Payenize it.
This article was originally published with the title "Liquid Glue" in Scientific American 8, 11, 81 (November 1852)