OF ARTS AND SCIENCES. 259 



It is difficult to give any numerical estimate of loudness and dis- 

 tinctness in such experiments as these. The following tables, however, 

 besides furnishing a more precise idea of our results, will show the 

 result reached in some attempt to form a numerical estimate of the 

 relative intensity under different circumstances. The loudness of au 

 ordinary magneto receiver when used with a magneto transmitter, 

 spoken into with a moderately loud tone of voice, is called 10. 



German- Silver Wire, Diameter .007 in., just below Redness. 



Length. Nature of Articulation. Comparative Loudness. 



10| inches . . . Faint, but distinct 3 



Ih " ... Clearer 7 



5 " ... Same as in last experiment . . 8 



3 " ... Poor and indistinct 4 



Platinum Wire, Diameter .0095 in., at Red Heat. 



10| inches ... No sound , 



7J " ... Very faint 1 



5 " ... Quite distinct speech 4 



3i " ... No sound 



Platinum Wire, Diameter .006 in., just below Redness. 



10| inches . . Distinct Fairly loud. 



7^ " . . No change in distinctness . . Loud as magneto. 



6^ " . . " " " . . Louder. 



4J " . . " " " . . Much fainter. 



2h " . . Very indistinct Barely audible. 



In the last experiment the wire was cool when the shorter length 

 was used. 



Platinum Wire, Diameter .005 in., just beloio Redness. 



7 inches . . Speech easily understood . . Moderately loud. 



5 " . . Clearer " " 



3 " . . Fairly distinct Fainter. 



Platinum Wire, Diameter .004 in., just below Redness. 



10| inches 

 7i " 



2I " 



Speech fairly distinct . . Faint. 



Very distinct IMuch louder. 



Clear Less loud. 



No sound Inaudible. 



Platinum Wire, Diameter .002 in., just below Redness. 



5 inches . . Fairly distinct 5 



3 " . . Less distinct 9 



If " . . No sound 



