▁and ▁Germany ▁a ▁te lect ros cope . ▁It ▁was ▁based ▁on ▁modified , ▁rot ating ▁N ip kow ▁disk , ▁photos ens itive ▁selenium ▁electro de ▁and ▁Ge iss ler ▁t ube ▁with ▁bright ness ▁mod ulation . ▁Wolf ke ▁was ▁inspired ▁by ▁Jan ▁Sz cze pan ik ' s ▁te lect ros cope ▁( in vent ed ▁a ▁few ▁years ▁earlier ), ▁but ▁his ▁project ▁was ▁wireless ▁using ▁elect romagnet ic ▁waves . ▁Two ▁years ▁later ▁he ▁de vised ▁a ▁mathematical ▁theory ▁of ▁surface ▁disp lac ements ▁on ▁a ▁plane . ▁ ▁His ▁first ▁science ▁publication : ▁" E lect ron , ▁considered ▁as ▁a ▁center ▁of ▁pressure ▁in ▁ ether " ▁was ▁written ▁in ▁ 1 9 0 7 ▁in ▁Paris . ▁In ▁the ▁same ▁year ▁he ▁had ▁a ▁presentation ▁in ▁the ▁Astronom ical ▁Society ▁in ▁Paris ▁about ▁the ▁idea ▁of ▁a ▁teles cope ▁with ▁a ▁con ca ve ▁mirror ▁– ▁it ▁was ▁giving ▁larger ▁magn ification ▁than ▁before . ▁In ▁recognition ▁the ▁Society ▁invited ▁him ▁to ▁particip ate ▁in ▁it . ▁ ▁After ▁arrival ▁to ▁W roc ław , ▁Wolf ke ▁invent ed ▁in ▁ 1 9 0 8 ▁a ▁c ath ode ▁t ube ▁with ▁a ▁glass ▁window , ▁and ▁in ▁ 1 9 0 9 ▁with ▁Karl ▁R itz mann ▁he ▁pat ented ▁a ▁cad m ium - mer cur y ▁lamp . ▁He ▁later ▁sold ▁his ▁rights ▁to ▁it ▁to ▁the ▁Carl - Ze iss ▁J ena ▁company , ▁where ▁he ▁worked ▁for ▁a ▁year ▁after