GOODYEAR ON G U M- E L A S T I C . 



claimed for maps of this sort, are very many. They possess an 

 intrinsic value for many other purposes besides those of instruc- 

 tion. They may be used with impunity as table or bed spreads, 

 or, in fact, as common crumb-cloths ; they may be doubled and 

 folded any number of times, and handled without care ; may not 

 only be washed, but also boiled in hot water or soap suds, with- 

 out injury to the goods or to the pi'inting. They are useful for 

 schools, as they can be brought to the desk of the pupil, instead 

 of his being compelled to climb to use them. In order to demon- 

 strate the utility of the fabrics for this use, the plates of this work 

 are printed on the fabrics, and the maps are executed both in 

 lithograph and copper-plate printing. It is deserving of special 

 notice, that the water-colors, as well as the print of these maps, 

 are indelible. 



EMBOSSED MAPS. 



Gum-elastic maps may be so embossed in the manner in which 

 hollow ware is made by engraved moulds, as to show the eleva- 

 tions and depressions of the earth's surface. The article may 

 be made as elegant as the foreign article of this sort, made of 

 pasteboard, and durable as caoutchouc. Beside the general 

 geographical correctness and utility of embossed maps, the 

 subject is one of philanthropic interest, concerning the well- 

 being and happiness of the blind. 



ILLUMINATED MAPS. 



Gum-elastic maps, when made of transparent tissue and illu- 

 minated, may be profitably used for instruction at night ; and 

 likewise large outline maps for illustration of lectures, &c. For 

 further explanation relating to this class of articles, see trans- 

 parencies, illuminated globes, &c., page 



