AMERICAN INSTITUTE. 



203 



PriBmatic Light. Top of Light. 



Prismatic Vault Lights. 

 Geo. R. Jackson & Co., 199 and 201 Centre street, New- York. 



The committee to whom this subject was referred reported that 

 these lights were tlie best on exhibition. 



[A silver medal having been before awarded. Diploma 



Improved Calliope. 

 American Steam Music Co., A. S. Denny, agent, Worcester, Mass. 



Calliope, designed for a Steamboat. 



This instrument consists of a number of steam whistles of proper 

 relative size to produce any desired musical scale, arranged in a 

 convenient manner, and provided with separate valves, by the 

 opening of which they are caused to receive steam or compressed 

 air from a suitable pipe, chamber, or generator, the said valves 

 being opened for the steam or air to escape to the whistles by 

 finger keys, like a chui*ch organ, or by the revolution of a studded 



