ific ▁legacy ▁ ▁Chal mers ' ▁most ▁end uring ▁publication ▁is ▁probably ▁his ▁text book ▁which ▁remains ▁one ▁of ▁the ▁clear est ▁introdu ctions ▁to ▁the ▁subject ▁available . ▁It ▁is ▁still ▁regularly ▁c ited . ▁His ▁work ▁on ▁cor ona ▁dis charge ▁laid ▁the ▁modern ▁found ations ▁of ▁the ▁subject . ▁His ▁last ▁paper , ▁submitted ▁post hum ously , ▁established ▁a ▁polynomial ▁relationship ▁between ▁em itted ▁cor ona ▁current ▁and ▁voltage ▁which ▁has ▁been ▁used ▁extens ively ▁by ▁research ers ▁studying ▁cor ona ▁dis charge ▁during ▁th under st orm s . ▁He ▁also ▁demonstrated , ▁by ▁simultane ous ▁measurements ▁at ▁Dur ham ' s ▁Observ atory ▁and ▁science ▁site ▁( 9 6 0 m ▁apart ) ▁that ▁charge ▁can ▁be ▁em itted ▁by ▁steam ▁locomot ives ▁and ▁power ▁lines ▁and ▁that ▁these ▁elect rical ▁structures ▁remain ▁ident ifiable ▁whilst ▁being ▁carried ▁by ▁the ▁wind . ▁ ▁Chal mers ▁died ▁following ▁a ▁short ▁ill ness ▁in ▁ 1 9 6 7 . ▁After ▁this , ▁the ▁group ▁was ▁led ▁at ▁Dur ham ▁by ▁Walter ▁H utch inson , ▁bro aden ing ▁to ▁include ▁collaboration ▁between ▁Dur ham ' s ▁atmos pher ic ▁phys ic ists ▁and ▁astronom ers . ▁ ▁On ▁ 2 6 ▁May ▁ 2 0 1 7 ▁the ▁Royal ▁Meteor ological ▁Society ' s ▁Special ▁Interest ▁Group ▁on ▁At mos pher ic ▁Electric ity ▁held ▁a ▁discussion ▁meeting ▁at ▁Dur ham ' s ▁Physics ▁Department ▁to ▁mark ▁the ▁ 5 0 th ▁anni versary ▁year ▁of ▁Chal mers