.L. CASELLA'S CATALOGUE 



FIG. 1919. 



PIG. 1953. 



CYLINDER ELECTRICAL MACHINES, 



The essential parts of which consist of a hollow glass cylinder as the electric, an 

 insulated rubber and prime conductor, the whole mounted in a plain useful manner 

 (fig. 1910), p. 165 ; an excellent instrument, but for the difficulty of fitting and re- 

 placing the cylinder when broken. 



1910. Cylinder Electrical Machine, on mahogany frame, with brass conductor and 

 glass cylinder, 6 inch, by 4 (fig. 1910), p. 165 , . , . 100 



1912. CYLINDER ELECTRICAL MACHINE ; 7 inch, by 5 . . 180 



1913. 8 inch, by 6 . . 200 



Plate Electrical Machines^ of the most improved construction, with brass con- 

 ductors, arranged so as to take the whole of the electricity from both sides of 

 the plate, brass clamps and improved rubbers, mounted upon polished maho- 

 gany frames (fig. 1919) : 



1914. PLATE ELECTRICAL MACHINE, 9 inch., a good plain practical instrument 



1 12 6 



1915. 9 inch., of best make . 215 



1916. 12 ditto . . 3 10 



1917. 12 ditto, with double receiving forks 



5 



