M. TECHNOLOGY. 547 



as usual ; also the mixing of this improved size with the pulp. 

 17-4, April 1, 1872, 252. 



IMPROVED LIQUID GLUE. 



An improved liquid glue, according to the Journal of Ap- 

 plied Chemistry, may be prepared by dissolving three parts 

 of glue, broken into small pieces, in twelve to fifteen parts 

 of saccharate of lime. On warming, the glue dissolves rap- 

 idly, and remains liquid when cold, without losing its strength. 

 Any desirable consistency may be secured by varying the 

 amount of saccharate of lime. 



The thicker glue keeps its muddy color, the thin becomes 

 clear, on standing. The saccharate of lime is prepared by 

 taking one part of loaf-sugar and dissolving it in three parts 

 of water, adding to the sugar one fourth part of its weight 

 of slacked lime, and heating the whole to 145 to 165, and 

 allowing it to macerate for several days, with frequent shak- 

 ing. The greater part of the lime will thus be dissolved, and 

 the solution may be decanted from the lime sediment, which 

 has the properties of mucilage. 



The solution of the glue in the saccharate of lime may be 

 made very readily ; and even old gelatine, which has become 

 insoluble in water, will easily be dissolved. The glue has 

 great adhesiveness, and admits of very many uses. Journal 

 of Applied Chemistry, November, 1872, 168. 



NEW SAFETY LAMP. 



A new form of safety lamp gives its indication of danger 

 by means of a musical flame. When a mixture of inflamma- 

 ble gas and air passes into the lamp it is ignited on the sur- 

 face of a disc of wire gauze, above which is placed a suitable 

 chimney, in which is produced the musical sound, varying in 

 pitch with the size of the flame and the dimensions of the 

 chimney. 15 A, August 17, 1872, 215. 



GLYCERINE BLACKING. 



A blacking may be made by means of glycerine, which is 

 said to be of very superior quality, and favorable to the pres- 

 ervation of leather. For this purpose six to eight pounds of 

 lamp-black and enough of ivory-black, are to be brought to a 

 homogeneous paste, with ten pounds of glycerine and ten 



