rii iv 





resistance, and therefore varies with the resistance. th.- 

 tension at the motor terminals will be altered by altering 

 the reaistan -e : we fhall thus be a!-!.- to vary the tension at 

 the motor terminals, and observe the corresponding speeds. 



DIAGRAM OF SPEED 



FOR DIFFERENT TENSIONS 



AT CONSTANT LOAD 



16 



It 'tin- tnpi- is incivjis.-l |ut k.-pf 

 chnn^- it> tin- t.-Ti*i..n. we Hhall i.htaiu n n-l:ti..n 

 K nn>. MI the figurr. >'!' \-\ng 



>>. th.- int.-n.-pt ,i U' 



new tonpif Thu- it th.. |..;n|s n r- k--pf rntnti? ilurin-.' 



(., 



Iff 

 equal 1.1 7 I ' ' . wl.,-r/' in the 



r S 



