472 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



be mixed with from three to five per cent, of raw linseed-oil 

 while the paint is being mixed together. 3^1, May 27, 388. 



USE OF SOLUBLE GLASS IX PAINTING. 



The Technical Journal suggests new applications of water- 

 glass in the arts, but especially in painting, where it appears 

 to furnish a means of applying certain colors to fresh wood 

 or clean iron in a most efficient manner, and at a very slight 

 cost compared with oil. It can also be used advantageously 

 for painting houses, basket-ware, decorations for theatres, etc., 

 and is especially suitable in the latter case, as it renders wood 

 incombustible to a certain extent, instead of increasing the 

 danger from fire, as with oil paint. Care must, of course, be 

 taken to use only such mineral colors as are not decomposed 

 by the glass, such as ultramarine, chrome green, Nuremberg 

 green, yellow and red earth, ochre, green earth, terra de Sien- 

 na, etc. In coating paper with this paint, a little glycerine 

 may be added to prevent its breaking. Coralline, ponceau, 

 and vesuvine have also been used to advantage in connection 

 with soluble glass. 6 (7, May 19, 198. 



PREPARATION OF WHITE LEAD FROM GALENA. 



Experiments are now being prosecuted to test the value of 

 an invention for preparing white lead direct from the ore. 

 For this purpose, ordinary galena is treated in an ore-crusher, 

 next roasted in an ordinary desulphurizing kiln, and then 

 mixed with carbon (preferably in a state of finely-washed dust 

 of anthracite coal) in the proportion of half and half. The 

 mixture is next to be heated in a compound oxidizing fur- 

 nace, when dense white fumes of vapor will pass oft". These 

 are conveyed into a separate chamber or receptacle, where 

 the vapors are strained through screens or bags of muslin or 

 other fabric, or are allowed to deposit by being slowly passed 

 through an extended chamber, in the way lamp-black, oxide 

 of zinc, etc., are usually collected. 8 A, March 1, 53. 



THEORY OF BOILED OILS. 



A valuable paper on boiled oils and varnishes, by Charles 

 W.Vincent, has lately been read before the Society of Arts, 

 of London, in which the theory of the various processes for 

 preparing oils and varnishes is given, and suggestions for im- 



