500 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



and five feet wide, and coarser mesh in proportion. 6 C, 

 January 4, 1872, 8. 



LIQUID GLUE. 



An excellent liquid glue is made by dissolving glue in ni- 

 tric ether. The ether will only dissolve a certain amount of 

 glue, consequently the solution can not be made too thick. 

 The glue thus made is about the consistency of molasses, and 

 is doubly as tenacious as that made with hot water. If a 

 few bits of India-rubber, cut into scraps the size of a buck- 

 shot, be added, and the solution allowed to stand for a few 

 days, being stirred frequently, it will be all the better, and 

 will resist the dampness twice as well as glue made with wa- 

 ter. 1 A, June 7, 1872,275. 



IMPROVED LIQUID GLUE. 



An excellent liquid glue can, it is said, be made by the fol- 

 lowing method : Take gum shellac three parts, India-rubber 

 one part, by weight. Dissolve the two substances in sepa- 

 rate vessels, in ether, free from alcohol, applying a gentle 

 heat. When thoroughly dissolved, mix the two solutions, 

 and keep in a bottle tightly stoppered. This glue resists 

 the action of water, both hot and cold, and most of the acids 

 and alkalies. Pieces of wood, leather, or other substances 

 joined together tight, will part at any other point than that 

 at which the joint is made. If the glue be thinned by the 

 admixture of ether, and applied as a varnish to leather, it 

 renders the joint or seam water-tight, and almost impossible 

 to separate. 18 A, July 3 2,1872,425. 



PREPARATION OF LIQUID INDIA INK. 



A convenient method of preparing liquid India ink for the 

 use of artists and draughtsmen consists in pounding a cake 

 into fine particles and dissolving it in hot water. When the 

 solution has become perfectly black and uniform, the tenth 

 part, by volume, of glycerine is to be added, and thoroughly 

 united by shaking the mixture. This may be kept in a cork- 

 ed bottle for a long time, and will remain completely liquid. 

 When cold, this forms a black jelly, which, however, can be 

 readily softened and liquefied by the heat of the hands. The 

 ink can be diluted to any necessary degree, and will be found 



