23 



the ratio — air to metal surface — below which the discharg- 

 ing power rises very rapidly. This effect is similar to that 

 which would result from considering the gauze as a limiting 



Fig. 



Table B. 

 Discharging Powers of Gauzes. 



Material. 



Copper 

 Copper 

 Copper 

 Copper 

 Copper 

 Copper 

 Copper 

 Brass x 

 Brass x 

 Iron X 

 Iron X 

 Iron X 

 Iron X 

 Brass x 

 Brass x 

 Iron x 

 Brass x 

 Copper ; 



Strands 

 per inch. 



8 

 . 16 

 , 24 

 . 32 



40 

 . 16 



32 



11 



15 



14 



17 



17 



20 



20 



25 



26 



40 

 120 



Diam. of 

 Wires, in 

 inches. 

 •016 

 •016 

 016 

 •016 

 016 

 •013 

 013 

 •0185 

 •0155 

 •013 

 010 

 013 

 •018 

 010 

 0095 

 •0245 

 •007 

 •0025 



Distance 



between Wires, 



in inches. 



127 



050 



027 



016 



010 



054 



020 



072 



051 



058 



05 



046 



032 



04 



03 



0245 



018 



037 



Air. 



Metal. 

 80 

 32 

 1-7 

 10 



•6 

 38 

 14 

 1-0 

 1^0 

 13 

 2-6 

 1^18 



• / 

 12 

 11 



•6 

 11 

 12 



Discharging 

 Power. 



11 

 13 

 1-75 

 30 

 12-0 

 1-25 

 212 

 1-35 

 1-5 

 15 

 145 

 18 

 2^7 

 165 

 2-5 

 385 

 5-45 

 490 



X Represents crossed mesh ganzes. 

 li Represents parallel wire gi'ids. 



