96 ANNUAL OF SCIENTIFIC DISCOVERY. 



three-quarters of a part of sulphate of zinc, and heats the mixture 

 to 185° F., for 10 or 12 hours. The mixture remains liquid after 

 cooling, and is said to be very useful for sticking wood, crockery, 

 and glass together — Mechanics* Magazine. 



Cement for Attaching Glass and Brass. — A resin soap is first 

 formed by boiling 3 parts of resin and 1 part of caustic soda in 5 

 parts of water, and then mixing this with half its weight of plas- 

 ter of Paris. This cement is said to be impervious to petroleum, 

 only superficially affected by water, to adhere very strongly, and 

 to be a bad conductor of heat. 



Zinc Cement. — We have before mentioned Soret's cement, 

 which is formed by making oxide of zinc into a paste with a solu- 

 tion of chloride of zinc. This paste quickly sets into a hard mass, 

 which may be applied for stojjping teeth and a variety of useful 

 purposes. Dr. Tollens gives a cheaper form of the same cement, 

 which may be used for stopping cracks in metallic apparatus, and 

 cementing glass, crockery-ware, and other materials. He mixes 

 equal weights of commercial zinc-white and very fine sand, and 

 makes the mixture into a paste with a solution of chloride of zinc 

 having the density 1.26. The mixture sets rapidly, but allows 

 plenty of time for its application. As it resists the action of most 

 agents, it will be very useful in the chemist's laboratory. — Me- 

 chanics'' Magazine. 



Metallic Cement. — A very strong and durable metallic cement, 

 we read in a German *' Mechanics' Journal," is formed when a 

 mixture of equal parts of oxide of zinc, sulphate of lead, peroxide 

 of manganese, and oxide of iron is made into a paste of proper 

 consistence with boiled linseed oil. 



Impermeable Cement. — A cement impermeable by air or steam, 

 superior to any in use for steam and gas pipes, is made by mixing 

 6 parts of finely powdered graphite, 3 parts of slaked lime, and 8 

 parts of sulphate, with 7 parts of boiled oil. The mass must be 

 kneaded well until the mixture is perfect. 



A NEW INK FOR PRINTERS. 



A new ink for printers has been invented by Prof. Dr. Artus 

 and Mr. Fleckstein, a master-printer at Lichtenhain, near Jena, 

 which ink is said to be a complete success. The composition of it 

 is as follows : — 



'* Venetian turpentine, 4^ ounces ; fluid soap, 5 ounces ; rectified 

 oleine, 2 ounces ; bui'nt soot, 3 ounces ; Paris blue (ferro-cyanic 

 acid), one-half ounce ; oxalic acid, one-fourth ounce; distilled 

 water, one-half ounce." 



The mixing process of this new, beautiful, and cheap ink is 

 described as follows : — 



"Gradually warm the turpentine and the oleine together ; put 

 the soap on a marble plate, and gradually add, continually rub- 

 bing, the mixture of turpentine and oleine ; when well mixed, add 

 the burnt soot, which must be well powdered and sieved before; 

 then add the Paris blue, dissolved in the oxalic acid, continually 



