▁res us cit ator . ▁ ▁In ▁ 1 9 4 9 ▁he ▁developed ▁a ▁mechanical ▁ass istor ▁for ▁an est hes ia ▁with ▁the ▁co operation ▁of ▁the ▁an est hes ia ▁department ▁at ▁Harvard . ▁ ▁In ▁ 1 9 5 5 ▁he ▁built ▁a ▁ple ural ▁su ction ▁p ump ▁for ▁post oper ative ▁thor ac ic ▁surg ery , ▁the ▁Em erson ▁Post op ▁P ump , ▁which ▁is ▁still ▁widely ▁used . ▁ ▁Late ▁in ▁the ▁tw enti eth ▁century ▁he ▁assist ed ▁Al vin ▁Bar ach ▁in ▁developing ▁the ▁" In - Ex su ff l ator ▁C ough ▁Machine ", ▁a ▁device ▁to ▁aid ▁in ▁secret ion ▁removal ▁in ▁patients ▁with ▁neur om us cular ▁disease . ▁ ▁Rel atives ▁Em erson ▁was ▁the ▁brother ▁of ▁Robert ▁Em erson ▁the ▁scient ist ▁who ▁discovered ▁that ▁plants ▁have ▁two ▁phot ore action ▁cent ers . ▁Em erson ▁was ▁the ▁great - grand son ▁of ▁the ▁brother ▁of ▁ ▁Ralph ▁Wal do ▁Em erson . ▁His ▁uncle ▁was ▁the ▁illustr ator ▁Max field ▁Par r ish . ▁His ▁first ▁cousin ▁was ▁Bart ram ▁“ B art ” ▁K elle y , ▁also ▁a ▁nep hew ▁of ▁Max field ▁Par r ish , ▁who ▁was ▁a ▁major ▁designer ▁of ▁military ▁hel ic op ters ▁for ▁Bell ▁A ircraft ▁and ▁Bell ▁Hel ic opter . ▁ ▁Pat ent ▁images ▁For ▁the ▁law suit ▁involving ▁the ▁iron ▁lung , ▁images ▁were ▁lack ing ▁on ▁some ▁of ▁the ▁old ▁pat ents .