OF ELECTKICAL INSTRUMENTS. 



167 



1918. Plate Electrical Machine 15 inch., of best make, with double receiving forks 



6 10 



1919. 18 ditto, ditto (fig. 1919), p. 166 800 



1920. 24 ditto, ditto . . 10 10 

 1922. 30 ditto, ditto . * 15 15 



Larger sizes made to order. 



1923. Plate Electrical Machine, on mahogany frame, 



with massive c ylindrical brass conductor, mounted 

 on two glass pillars, new form, inexpensive and 

 efficient, 16-inch, plate . . 440 



1924. PLATE ELECTEICAL MACHINE, as above, 18-inch. 



550 



1925. Ebonite Plate Electrical Machine, mounted in 



mahogany, with cylindrical brass conductor, on 

 two pillars as above, with plate 16 inches 

 diameter . . . 400 



1926. EBONITE PLATE ELECTEICAL MACHINE, as above, 



18 inch, diameter . . .550 



The strength and durability of the plates of these machines 

 adapt them admirably for carriage to India and the colonies. 

 FTG. 1934. 



1927. Woodward's Double Circular Glass Plate Electrical Machine, in handsome 



mahogany frame with negative and positive conductors, 12-inch. 11 11 



1928. WOODWAED'S DOUBLE CIECULAE GLASS PLATE ELECTEICAL MACHINE, as 



above, 18-inch ....... 16 16 



1929. Harris's Circular Glass Plate Electrical Machine, 18-inch., with mahogany 



open rectangular frame, mounted with brass negative and positive conductors, 



18 



1930. HAEEIS'S CIECULAE GLASS PLATE ELECTEICAL MACHINE, as above, 24-inch. 



21; 3-feet. . ' V ; . . 42 10 



Winter's Plate Electrical Machine (Jig. 1934), with insulated mounting, and 

 metallic covered ring by means of which the length of an electric spark may 

 be greatly increased; thus the 6 inch, plate gives about a 3 inch, spark, the 

 12 inch, about 5 to 6 inch., 18 inch. 9 to 10 inch., and the 24 inch. 10 to 12 

 inch. 



1934. WINTEE'S ELECTEICAL MACHINE, as above, 9 inch., 2 6s. ; 12 inch., 3 16s. ; 



18 inch., 6 15s. ; 24 inch., 12 15s. ; if with insulated cushion 16 



1935. HOLTZ'S ELECTEICAL MACHINES made to order. 



1336. CIECULAE GLASS PLATES, for electrical machines, with polished edges and 

 centre holes : 



9-in. diameter, i-in. thick. 9 6 



12-in. i-in. 11 6 



16-in. TV in - 17 6 



18-in. T Vin. 140 



20-in. *-in. 190 



24-in. diameter, 

 30-in. 

 36-in. 



48-in. 



f -in. thick. 1 18 



f-in. 2 13 



|-in. 4 -17 6 



f-in. 10 



