170 



L. CASELLA'S CATALOGUE 



FIG. 1950. 



O 



FIG. 1963. 



FIG. 1965. 



FIG. 1980. FIG. 1975. 



APPARATUS. 



1966. INSULATING STOOLS, polished mahogany, with- glass legs, 12 by 10 inches, 



10s. ; 14 by 12 inch., 14s. ; 16 by 14 inch. . ^ . G 18 



1967. ELECTEOPHOEUS, best, with two metallic and an intervening ebonite plate, for 



obtaining the electric spark . . . ;i : . 100 



1968. EGG-SHAPED GLASS, with stop-cock, to show light in vacuo . ^ 1 15 



1969. Electrical Flask; with brass cap and valve for exhaustion '\ . 066 



1970. SPOETSMAN, consisting of Leyden jar, carved figure of sportsman, 

 and pith birds on brass conductor (fig. 1970), p. 171 . 18 



1972. DIAMOND JAB, 1 pint . '.VJTV= *: .' C, '' '^ 060 



1973. BEASS CHAIN, per yard . '. : . . . '. ' 004 



1974. BUCKET AND SYPHON . -. ; *- -.- ' 046 



1975. ELEGTEICAL SWING, for show ng the repulsion of bodies similarly electrified 



. . . . .: 076 



