OF ELECTEICAL INSTRUMENTS. 



171 



FIG. 1993. 



FIG. 1982. 



FIG. 1970. 



1976. Electrical Swan, placed on the surface of a vessel of electrified water, will be 



attracted by presenting tbe finger .... 2 



1977. ELECTEICAL SPIDER, wben electrified will be attracted by a ball, but repelled by 



a point 0,10 



1978. ELECTEICAL WHIRL OR FLY WHEEL, rotating by dispersing electricity from 



the points ...... 029 



1979. ELECTEICAL PISTOL, for exploding oxyhydrogen gas . . 056 



1980. SEE-SAW (fig. 1980), p. 170 . . ' . 096 



1982. ELECTEICAL FIGURES, carved in cork, representing Neptune, mermaids, etc. 

 (fig. 1982), each . . . . . . 040 



1984. SET OF THREE BELLS, on brass beam to suspend -from the conductor, and made 



to ring by the alternate blows of a brass ball suspended by a silk cord , 5 6 

 to . . . .. . .. .. . 086 



1985. FRENCH BELL EXPEEIMENT, for illustrating the chiming of bells, one bell being 



connected with the inner, and the other with the outer coating of a Leyden 

 jar 11 6 



1986. ELECTEICAL OEEEEY, representing the motions of the sun, earth, and moon 



070 



1987. GAMUT OF EIGHT BELLS, on a mahogany stand, with an electrical fly or whirl 



carrying a clapper, and supported by a glass spiral luminous revolving tube, 

 the clapper at the same time striking each of the bells in succession 1 10s., 

 or carefully tuned . . . . . . 2 10 



1988. OllC Spiral or Luminous Tube, with whirl at the top, which, when charged, 



revolves and presents a moving spiral stream of electric light 10 6 



1989. HAND SPIRAL OR LUMINOUS TUBE, consisting of two glass tubes with brass 



caps, the inside one covered with spangles of tin-foil, giving a spiral stream 

 of electric light . ... . . . 036 



1990. FALLING STAR OR AURORA TUBE, with valve for exhaustion . 10 6 



1992. HENLEY'S UNIVERSAL DISCHARGER, for voltaic or frictional electricity, with 

 press and table for deflagrating metals or exposing various substances to 

 electrical action; also charcoal forceps for showing the electric light, mounted 

 on mahogany table . . . . . 1 5 O 



