680 



GLUE 



1112 



needlewoman's foot, whenever she wishes to separate the two jaws, in order to insert 

 between them ^ the parallel edges of leather to be sewed. The instant she lifts her 

 foot, the two jaws join by the force of the spring G, which pushes the moveable jaw 

 E against the stationary one D. The spring is made fast to the frame of the vice by 

 the screw H. 



After putting the double edge to 

 be sewed in its place, the woman 

 passes her needle successively 

 through all the teeth of the comb, 

 and is sure of making a regular 

 seam in every direction, provided 

 she is careful to make the needle 

 graze along the bottom of the 

 notches. As soon as this piece is 

 sewed, she presses down the pedal 

 with her toes, whereby the jaws 

 start asunder, allowing her to in- 

 troduce a new seam ; and so on in 

 quick succession. 



The comb may have any desired 

 shape, straight or curved ; and the 

 teeth may be either larger or 

 smaller, according to the kind of 

 work to be done. With this view, 

 the combs might be changed as 

 occasion requires ; but it is more economical to have sets of vices ready mounted 

 with combs of every requisite size and form. 



It is estimated that the value of the gloves manufactured in France is between 

 1,600,000. and 2,000,000^, and is still rapidly increasing. The kid and lamb skins 

 used for glazed gloves are dressed at Paris, Grenoble, Annonay, Romans, and Charle- 

 mont. The Paris manufacturers whose gloves are most esteemed employ workmen 

 from Vendome. 



GliUCIBTA ( Glucine, Fr. ; Beryllerde, Ger.) is one of the primitive earths, 

 originally discovered by Vauquelin in 1797 in the emerald of Limoges; he called 

 it glucina from the sweet taste possessed by its salts. Its existence in several other 

 minerals has since been proved: viz., in cymophane or chrysoberyl, phenacite, euclase, 

 gadolinite, leucophane, &c. Its properties have been comparatively little studied, 

 owing to the tedious and expensive processes required for its preparation. 



GXiUCZHTUXVX, the metal of Glucina, has been obtained by M. H. Debray (Ann. 

 Chem. et Pkys. xliv. 5) by the following process : Into a wide glass tube are intro- 

 duced two vessels, one containing chloride of glucinum, and the other sodium, 

 deprived of the greatest part of the adhering naphtha by compression between two 

 sheets of blotting-paper. The glass tube is placed in a combustion-furnace. It is 

 then traversed by a current of hydrogen, passing from the chloride of glucinum to 

 the sodium. The sodium is not placed in the tube until all the air has been expelled 

 by the hydrogen. The tube is then heated just where the sodium is placed, which by 

 this means is deprived of the last particle of naphtha, and fuses. The chloride of 

 giucinum is then heated. The vapour of chloride driven forwards by the hydrogen 

 arrives over the fused sodium. It then swells up, and the heat generated by chemical 

 action is sufficient to raise the contents of the vessel to redness which often breaks the 

 vessel if made of porcelain. The operation is ended when the chloride of glucinum 

 sublimes beyond the sodium vessel. "When the tube is cool the vessel is withdrawn, 

 and in the place of the sodium a large quantity of a blackish substance is found, 

 composed of common salt and the metal glucinum in brilliant spangles, and some- 

 times even in globules. This match is quickly detached and fused in a small crucible, 

 with the addition of some dried common salt, which acts as a flux, and facilitates tho 

 union of the globules of metal. 



It is a white metal, whose density is 2-1. It may bo forged and rolled into sheets 

 like gold. Its melting-point is inferior to that of silver. It may be melted in the 

 outer blowpipe flame, without exhibiting tho phenomenon of ignition presented by 

 zinc and iron under the same circumstances. It cannot be set on fire in an atmo- 

 sphere of pure oxygon, but in both cases is covered with a film of oxide, which seems 

 to protect it from further action. It is not acted on by sulphur, but readily combines 

 with chlorine and iodine by tho aid of heat. See Watts's ' Dictionary of Chemistry.' 

 GLUCOSE. The name given to grape- and starch-sugar by M. Dumas. 

 GXiUE (Colle forte, Fr. ; Leim, Tischlerleim, Gor.) is the chemical substance gela- 

 tine in a dry state. The preparation and preservation of the skin and other animal 



