-- ,2 S h e l l Development C o m p a n y Em e r y v i l l e , Ca l i f o r n i a January 4, 1951 TELEPHONE OLYMPIC 3 - 2 1 0 0 V 1 ; DR.

NHT Oat 7- , l'i^h . - f . 1 i* or* c n m n i o d a t i o n s . ' A n o v e r f l o w (J ln n n r f n s | dflu to p l a n n e d at the*; Wu jd orf -A Hift u JiD A i r II Think CnUon A riuroulatrU , 1 J/i H u n g a r y , "T u r g e n t, III,' t l r k - I f l f o r H . n !

'REPRODUCED ---- Al 'HE natio n alT TApRcCHIVES I -> 1 C H U R C Mi si t ?

/\ November 20, 1936.

THE UNIVERSITY OF BRITISH COLUMBIA \ ANCOUN ER 8, CANADA DEPARTMENT OF GEOLOGY December 2nd, 1963* Dr.

January 11, 1965 Hugo 0.

C K L.

REPRODUCED AT THE NATIONAL ARCHIVES SCIENTIFIC AM E RICAN THE JOURNAL OF PRACTICAL IN FO R M A TIO N S cientific American (ESTABLISHED 1845) P u b l is h in g C o m p a n y M u n n & Co.

ThaoAt Mldgley, and his eoworfcers (J, Ind, End* <Jb*# 14 894# 1982)# employed la the research staff of the Oeneral Motors Corporation at Dayton Ohio# have discovered that oeriain eoopounds when introduced into the gasoline set as "Antiknock" or "Opmpres aionisers" in that they prevent the knocking in engines running at low speed or at high compression* The most important of these compounds are d&thyselenid* and tetra ethyl lead At the present tine the Dye Works Plant of 8 1 du?

ILce&i^l IfimcffluiislipSea Asaa^cciiaittacEm F H EL .C I .

January 15, 19^7 Mr.

S3AIH0HV TYNOIiLYN j 3hj, v aaonaoadan | (ialwnlria oMliixiilp (!

,,.fot!

INSTITUTE OF C H ILD HEALTH U n iv e h st y o f L o n d o n M H C T O m N U m L D m O K U O R o r C H tiO HKALTM.

U M 4e/ To: Mr.