906 Tkansactioxs of the Amebic ax Institute. 



enee in temperature to wliicli the cylinder is subjected during the 

 steam and exhaust strokes. The non-conducting coat was entirely 

 successful in accomplishing this object, though further experiments 

 are necessary in order to make the application practically successful 

 on the wearing surfaces. If the enamel is made of the proper mate- 

 rials it is quite durable. 



Dr. Vanderweyde remai'ked that the old way of enameling was to 

 paint the enamel on. The invention here is based on the ])eculiarity 

 of different metallic oxyds to form colored compounds with silicates; 

 it was the way in which colored glass is made, glass painting was 

 executed, porcelain and earthenware was ornamented. Only in this 

 process the principle of the chromo-litliograph was brought in use, 

 in order to produce cheap enameled-colored pictures without the con- 

 tinued labor of the artist. The pictures Avere first printed on paper 

 with different metallic oxyds in place of colors, and were then uni- 

 formly broWn, while the color intended is only brought out after the 

 treatment with the silicate in the lire. The paper print is transferred 

 to the porous silicate coating previously baked on the surface of the 

 iron, in the same way as is done on earthenware and porcelain ; it is 

 then a second time exposed to the lire to bake the metallic oxyd in 

 and burn the paper oft'; it is then covered M'ith a silicate glazing and 

 exposed to a heat of over 2,000 degrees Fahrenheit, when this glazing 

 melts, giving the finishing treatMient to the metallic oxyds, whioli 

 then in their perfect combinations with the silicate, form the different 

 colored compounds, as, silicate of manganese for purple, silicate of 

 cobalt for blue, silicate of gold for red, of uranium for yellow, of iron 

 for green and brown red, of copper for bright red and emerald green, 

 of antimony for orange, etc. 



Railway IIeadricst. 

 Mr. L. Dederick, of 35 Park Place, in this city, exhibited a head- 

 rest, designed to enable railway travelers to sleep in a car in a sitting 

 position. It consists of an air-tight India rubber bag, shaped like a 

 collar, which is inflated by the breath ; at each end is a strap, ter- 

 minating in a loop or ring. Tlie collar is placed around the neck, 

 back of the head, and rest upon the shoulders. The arms pass through 

 the loops or rings, the straps of which are crossed in front. The 

 weight of the arms acts as a counter balance to the head, M'hich is 

 sustained from all sides. The apparatus can be made so small that 

 it can l)e put in the pocket Mhen not in use. Some of these head- 



