162 ANNUAL OP SCIENTIFIC DISCOVERY. 



Color for Slate. For the preparation of light colors to be used in 

 enamelling or Japanning slate, whbh will stand the action of the heat 

 from the fire without blistering or discoloration, and be sufficiently 

 hard to resist scratches. 



Electric Weaving. To the manufacturer who practically applies 

 electricity to the production commercially of figured fabrics in the 

 loom. 



Japanning Zinc. For a process whereby the surface of articles 

 manufactured in zinc may be economically japanned. 



Coating Walls. For the production of a cheap white enamel-like 

 composition for the interior walls, etc., of houses, applicable to all or- 

 dinary surfaces, easily cleansed, not liable to crumble or chip, and 

 capable of being tinted. 



Substitute for Turpentine. For a new and efficient substitute for 

 turpentine, applicable to the manufacture of varnishes and to purposes 

 for which turpentine is now ordinarily applied. 



Substitute for Pitch. For a cheap substitute for pitch, tar, &c., 

 equally impervious to air and moisture, but not inflammable. 



Paper Machinery. For a portable machine for planing the bars 

 of a rag-engine-roll true when the roll is in position. 



Rollers for Printing Paper-Hangings. For a composition for feed- 

 ing rollers for printing paper-hangings by cylinder-machinery, similar 

 in consistency and texture to the gelatine rollers used in letter-press 

 printing, but adapted for working in water-colors. 



Paper-Hangings Colored in the Pulp. For the manufacture of 

 papers from colored pulp, bearing upon them designs, either colored or 

 white, discharged after the manner of calico-printing. 



Green icilhout Arsenic. --For the manufacture of a brilliant green 

 color, not containing arsenic, copper, or other poisonous materials. 



Improved Chemical Balance. - - For the best chemical and assay 

 balance, suitable for the use of students and experimentalists, which 

 will (with 600 grains in each pan) show a difference of .005 or less. 

 To be sold at a moderate price. 



Cheap Spectroscope. For the best and cheapest form of spectro- 

 scope. 



Dialysing Apparatus. For the best and cheapest form of dialysing 

 apparatus, capable of being packed in a small compass, but of sufficient 

 size to aid the country practitioner in the detection of poisons and 

 adulterations, and in the preparation and purification of salts and drugs. 



Incombustible Wick. - - For the production of an incombustible wick, 

 suitable for oil, spirit, and other lamps. 



Cijanogen Compounds. For the economical production of cyanogen 

 compounds for employment in the arts, or as manures. 



Oxygen Gas. - - For a more economical process of obtaining oxygen 

 gas than any in present use. 



New Edible Hoots. For the discovery and introduction into this 

 country of any new edible root, useful as food for man or cattle, and 

 capable of expensive and improved cultivation. 



Edible Seaweeds. For a means of rendering seaweeds generally 

 available as a wholesome vegetable food on board ship. 



Colored Searches. For the production of a series of colored starches, 

 which can be applied to articles of dress, such as lace, etc., without in- 



