SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 27. NO. 3, PL. 44 



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220O 



2100 



2000 



25 50 75 I0O 125 150 175 200 225 250 275 300 



RESISTANCE OF WIRES AT GIVEN VELOCITIES 



ORDINATES-VELOCITY IN FEET PER SECOND 

 ABSCISSAE - RESISTANCE IN GRAMMES 



