WIRELESS TELEGRAPHY— X OCTAVES 





Wave Leng 



th 



Frequency 

 Thousands 



Octaves 



Meters 



Feet 



Per Sec. 



X 



1720 



5641 





1 



1220 



4000 



246 





860 



2820 







610 



2000 



492 



2 



430 



1410 







305 



1000 



984 



3 



244 



800 



1230 





215 



705 





4 



107.5 



352 







HERTZIAN WAVES- 









Millions 



1 



Meters 



Ft. & In 



Per Sec. 





53.75 





9.84 





30.48 



100' 





2 



26.87 







3 



13.43 









12.190 



40' 



24.6 



4 



6.72 







5 



3.35 









3.048 



10' 



98.4 



6 



1.68 

 Millimeters 







7 



840 







8 



420 









304.8 



1' 



984 



9 



210 







10 



105 







11 



52.5 







12 



26 







13 



25.4 



1" 



11811 





13 



.5" 







6.5 







References 



14 



Note : The waves now used in 

 wireless telegraphy vary from 

 100 to 10,000 meters in length 

 making many more octaves in 

 this division than are here 

 shown. 



Waves of these lengths and 

 longer are chiefly used in wire- 

 less telegraphy. 

 -FOURTEEN OCTAVES 



These waves were chiefly used 

 by Hertz in his experiments. 



.158" 75000 



Shortest Hertzian waves meas- 

 ured by Lampa 1897. 



UNKNOWN RADIATIONS— FIVE OCTAVES 





Microns 









3280 







2 



1640 



Unknown Radiation. 





3 



820 







4 



410) 







5 



205) 







DARK HEAT OR INFRA-RED 



SPECTRUM— EIGHT OCTAVES 







Wave Length Frequency 



References 





Millions of 



Note: Paraffin, benzine and car- 







Millionths Millions per 



bon bisulphide are transparent 





Octaves 



Microns of In. Second 



to all heat rays. Water is 





1 



102.5 



opaque. 







100 3937 3 



Limit of measured heat rays. 

 Limit of Ruben & Nichol's 



4 



2 



67 2638 4.5 



measurements, 1898. 



5 





51.25 



Heat waves of these values 





3 



30 1180 10 



emanate from the earth. 



6 





25.6 



Sylvine in thin plates becomes 







25 984 12 



opaque. 



7 



35 



