852 7 RANSACTIOyS OF THE AMERICAN INSTITUTE. 



result may be judged from the present advanced position of our high 

 pressure engines. By fully discussing the subject of economy, and 

 generally circulating complete records of competitive trials, an 

 important branch of industry will be stimulated, all classes benefited 

 and American engineering become the standard throughout the 

 civilized world. 



Adjourned. 



October 29, 1868. 



Professor S. D. Tillman in the chair ; Mr. C. E. Emery, Secretary. • 

 , Pianos for Children. 



Mr. Theodore E.oz exhibited his infants' key-board for the piano. 

 This board is intended to be placed on any piano, when used by 

 children, and each key struck operates a corresponding one on the 

 piano. By this arrangement the small hands of children are enabled 

 to strike the octave. ' This key-board is intended as an attachment to 

 the piano. Mr. Roz has also a key-board to transpose a tune from 

 one key to another. 



Improved Screw Driver. 



Mr. Edgar J. Amor showed his combined screw driver and wrench, 

 designed not only to enhance its utility in its legitimate function of 

 driving screws, but also to enable the implement to be used, when 

 desired, as a wrench for turning reamers, taps, and the like. 



The driver may be of any ordinary or suitable form, and furnished 

 with the usual and appropriate handle. Provided in the inner portion 

 of this driver, or rather of the blade thereof, are any desired number 

 of holes, these holes being of square, oblong, triangular or other form, 

 to suit the end of the tap or other article for turning which, as by a 

 wrench, the driver is thus fitted. The outer or other portion of 

 this blade of the driver is furnished with an oblong hole or slot, 

 which constitutes a socket for the reception, on occasion, of one end 

 of a supplemental driver, which may be of the forked variety. When 

 the supplemental driver is thus fitted into the blade of the other, first 

 described, the latter constitutes a cross handle for the former, which 

 may then be used with greatly increased power for turning screws, 

 etc. The supplemental driver may, furthermore, be furnished with 

 suitably shaped holes, in the same manner as the inner portion of the 



