Document qdbMx9qk79Eb24vRbe3nx0gJR

Et h y l Ga s o l i n e Co r p o r a t i o n Ch e m i c a l R e s e a r c h La b o r a t o r y 76 0 0 We s t 'Ei g h t Mi l e Ro a d De t r o i t ,Mi c h i g a n February 20, 1940 D r . Rob er t A. Kehoe Dear Bob ; I spen t th e day a t th e Gen eral E le c t r ic lab o r at o r ie s in Sch en ect ad y F r id a y , and one o f t h e i n t e r e st i n g t h in g s -which I saw i s t h e i r l a t e s t t ype o f m ercury d e t e c t o r . Th is o p e r at e s on a co n st an t st r eam o f a i r pumped th rou gh th e equipm en t and giv e s a d i r e c t r e ad in g o f m ercury c o n c e n t r a t io n dorm t o an ex t r e m e ly low f i g u r e . The p r i n c i p l e fo llo w e d i s t h e a b so r p t io n by th e m ercury vapor o f a mercury reson an ce r a d ia t io n em itted by a mercury a r c . I d iscu ssed w ith se v e r al o f t h e ir people th e p o s s i b i l i t y o f m akin g a sim ila r le a d d e t e c t o r , an d -while t h e r e was some d isagr e e m e n t a s t o ju s t how t h i s would be d e sign e d , t h ey seem t o f e e l t h a t th e problem look ed a t l e a s t p r o m isin g. X am p a ssi n g t h i s on t o you fo r in fo r m at io n and aL so t o g e t you r r e a c t io n a s t o w h eth er you t h in k i t i s -worth w h ile t o t r y t o push t h is any fu r t h e r . Very sin ce r e ly you rs, GC :AIAJ c c ? D r . Graham Edgar u HE 0020159