Document 0gwEmO4xKjXeo6DbDYKV29pLm

FILE NAME: Ford (FD) DATE: 1970 Feb 12 DOC#: FD253 DOCUMENT DESCRIPTION: Letter to William Pierson, Chemistry Dept, Ford from the OH Dept of Health DEPARTMENT OP HEALTH. EDUCATION. AND WELFARE PUBLIC WEALTH SERVICI can.iuuten, T iaw-Artg EN V IR O N M E N T A L H E A L T H S E R V IC E F03907 lOIii Broadw ay, Cincinnati, Cfcio 15202 IR V I KOSHER? A L COWtHOL ADHIHUTRATIOR February 22, 1970 Mr, V i l l i be. R .Iie r s o n Chesis try Department S c ie n tific Research S ta ff fo rd Motor Compaiy P . 0 . Beat 20?> Dearborn, Michigan 1|8121 Dear Mr. Pierson A t the electron aicroacope m agnification we used.in our work on brake ` 'f lin in g decomposition we were able to resolve elemente rf chrysotile -r* >;' <i'1' 't f ib r ile s . Since objects smaller than th is coaid not be considered i,,. asbestos, we assumed that we were able to dee a ll asbestos fib e rs , -l - I hart also heard the suggestion that higher R eunification sdght / reveal more fiber# althac.'. i t is not clear why some objects t f a ^ ~- given eizs and opacity would be v isib le a t a lower m agnification w hile others o f the same size and opacity would n o t. Ib is point is presently being explored at K t. Sin ai H ospital in Hew Tork C ity , using some of the samples from ay o rigin al study. Vhen they have arrived at sene conclusion, I w ill le t you know. Sincerely youre, Jeremiah R , lynch* C h ie f, Laboratory of Engineering Bureau o f Occupational Safety and Health 011074 8000 0062 PRODUCED BY FORD Qi.az 5003-1