546 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



the action of moisture and the air. To cause oil colors to 

 dry rapidly, equal parts of this varnish and of the color are 

 to be rubbed up with oil, and spirits of turpentine added un- 

 til the whole forms a homogeneous liquid mass. Objects 

 coated with this mixture will dry completely in ten or fif- 

 teen minutes, according to the season or state of the atmos- 

 phere. 9 B, April 11, 1872, 409. 



IMPKOVED FLUX. 



A mixture of equal parts of cryolite and of chloride of ba- 

 rium, it is stated, forms a flux superior to borax for soldering 

 iron, or brazing copper, brass, or bronze. 15 A, August 10, 



1872,183. 



SOLDER FOR STEEL AND BRASS. 



A solder for uniting steel to brass, and one which adheres 

 perfectly to both, and is not affected by the unequal dilata- 

 tion of the two metals, is composed of three parts of tin, 

 thirty-nine and a half parts of copper, and ten parts of zinc. 

 9 B, March 14, 1872, 352. 



NEW GLUE SIZE FOR PAPER. 



A new glue size for paper-makers is described in the Ger- 

 man papers as being nearly 50 per cent, cheaper than the 

 old kinds, and much more suitable for paper. To produce 

 this size, dissolve in a copper pan, heated by indirect steam, 

 45 to 50 pounds of soda in 200 to 240 pounds of boiling 

 water; then add to it, stirring well at the time, 300 pounds 

 of powdered resin, keeping the whole continually boiling un- 

 til all the resin is perfectly dissolved, which is generally 

 accomplished in three or four hours. This soda-resin com- 

 position, dissolved in the proportion of 1 pound of resin to 

 30 or 40 pounds of water, is to be mixed together with a 

 glue solution, made by dissolving 100 pounds of glue in 

 about 300 to 400 pounds of water; then boil up both solu- 

 tions together for about ten minutes, after which run the 

 mixture through a fine sieve or filter, and it is then ready for 

 use. The best proportions for mixing the vegetable and 

 animal sizes are, for one and a half parts of resin, add one 

 part of glue ; or, for some purposes, equal parts of each can 

 be taken. The addition of starch, if required, can be made 



