THE IM U K\< ]: OF THE FREQUENCY 91 



. 11 coni 



Some of the important differences in tin- dr.-i-ns, of which 

 the 1 iata are given in Table 11, are brought together 



in Tail.- \'l. The most striking difference is in the \vri-_ 



general outline drawings of the three designs are shown in 



i ebon v. rv clearly the 



influence of the periodicity upon the relative proportions of 

 icr. 



I -SHuwr ODD n v 



ELMERS. 



o three designs have been pn-purt-tl on the basis of the 



Bo \\i.i.- i- ih. 

 ice of auomptions on which oompari* : 



\\itli :i of the imp. 



baofatelj 



