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THE ROYAL SOCIETY OF CANADA 



w = 2.5, 3.5, etc., having the wavelength X= 10140 Â.U. as its first 

 member, may be represented by electrons passing from the (m, S) 

 positions into the (2, P) position. The lines of the second subordinate 

 series of triplets are represented by electrons passing from the (w, s) 

 positions into the (2, pi), (2, P2) and (2, p-.^) positions; the lines of 



the (1.0, S) — (m, po) series, a combination series, by electrons passing 

 from the (w, p^) position into the (1.5, S) position. By this dia- 

 grammatic representation of series frequencies, one can see at a 

 glance, not only how the various members of principal and subordinate, 

 series arise, but also how the members of the various combination 

 series may be obtained. 



On the basis of the Bohr atomic theory, we have a central 

 nucleus surrounded by ring orbits in which electrons revolve. As 

 long as an electron remains in the same orbit there is no radiation. 

 According to Bohr, radiation is due to the loss of atomic energy caused 

 by the passing of electrons from an outer to an inner orbit, this loss 

 occurring in integral multiples of the quantum of the monochromatic 

 radiation concerned. 



