MAWSON & SWAN, 21 



Carbon Plates, 4x2 6x3 8x4 



Price 6d. i/- 19 each. 



Copper Wire, per lb., No. 16, 2,6; No. 24, 3/4 

 Copper Wire, covered with cotton, conductivity of copper guaranteed 



90 per cent and upwards. 



Nos. - 14 16 18 20 24^ 28 32 36 

 Feet to lb. 48 70 128 220 420 960 1,300 3,810 



29 29 29 3/- 4/- 5/6 8/6 10 '- perlb. 

 Copper Wire, covered with silk, the silk specially prepared for 



insulation. 

 Xos. 16 24 28 32 36 40 42 



6/6 8/6 10/6 13/6 i8/- 28/- 367- perlb. 

 These covered wires, though not the cheapest, are the best procurable. In 

 smaller quantities than I lb. a slight advance in price is made. 



Copper Wire, covered with India rubber and gutta-percha, see Electric 



Bells. 

 Copper Strand, covered with cotton, plaited, very flexible, useful for 



battery handles and a variety of connections, 6d. per yard ; 



double strand, rod. per yard. 

 Commutators, or Switches, for turning off or diverting the current, one 



way 3 '-, two way 36, three way 4'-; for affixing to coil, 6/- and 



86; on separate stand, best quality, 10/6 



FIG. 92A. 



Contact Breakers, 3/6, 4/6, 5 -, 6 6 each. Bertin's (Fig. 92A), 35'- 

 Gutta-Percha Tissue, 2'- per yard, about 24 inches wide. 

 Platinum, Foil or Sheet, 5 - dram; price varies. 

 Platinised Silver, for Smee's battery, 12 /- oz. 

 Zinc Cylinders, for Bunsen's 



Height in inches 3! 6 7 8 



i - 2 - 2/3 2/6 each. 



Zinc Plates, bent for Grove's or Bunsen's, i '6 and 2/- each. 

 Zinc Plates for Smee's, per pair, i/- and 1/6 

 Zinc Rods for Daniell's, 4^-in. 6d., 6-in. 9d., and 9-in. i/- 

 star shaped, 1/3 each. 



13 and 15, Mosley-street, Newcastle-on-Tyne. 



