'i''fJ'Ij.' S.1.n Frar~cisco, 't.'h i tc DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE 5D-OSI/Jill/ ejh WASHINGTON "" ltiiPlUOI ., till&~. Ul&r '"' ott'IIC' orrecr or tf'rctu '"""tOueo IEQ.""'"'"uso All roiCr uu. oano. o 8 Noveaber 1950 SUBJEC'l' t tJNim!fl'IFI!D OBJ'IO! ObseJved directly cwerhead San Franciaco, California at approximatel7 0930 houra, 3 Noveaber 19SO COII!DIIr!ing Oeneral Air Materiel Wright-Patterson Air Poroe Base Dayton, Ohio Attentiont g,Is 1. Attached hereto for 7our information and necessar.y action are ot a letter from the 19th OSI District (IG), subject as abovo, 3 November 1950, tile 19D OSI 24/40 SIR-16. 2. No investigative action is being taken by this office at this time with regard to above subject. 1 Inol (in dup) Ltr, dtd 3 Nov SO JAMES F. X. 0 COJlNELL . Lt Colonel, USAF District Commander DOWNGRADED AT DECLASSU,IED AFT R mlCI:ASSIEl~ Of TMI All POICI HEADQUAITERS UNITED STATES AIR WAIHIMOTOU TMI INIPICTOI OENUAL UIAP 19th DlmiCT OFFICE OF SPECIAL INVESTIGATIONS PAIIPIEU~IUIIUN All POICI IASf, CALIPOINIA 8118.JEClr I ORJDEm'Irlm OBJEOf Observed direct17 Oftin.d Sa Cali romia at appz-adte17 0930 bon a, :J lovellber 1950 Director of Spec SAl Inuo8tlgat1GI', Beadqat.rten~ mg, WaahingtOD 25 1. tt:Offi ;m I Unusual object obeerted in 1k7 directJ.7 oYerbN.d San F1-anc1aoo at 0930 boura, 3 Bow 1950. On 3 Hove 1950 Mr. k;ast Palo Alto, California waa 1ntert1ewed abd tbnt be 1n oompar17 with oicht or ten other people observed a bright object lD the al..-y direot1.7 ovorbead. At this tioo the7 were warlc1.nl in the Southern Pacific !'night Yard at 4th and 5th Street to Ti.Dg, San Francieoo, Olliorn1a. The object waa obaervad for a period ot t ... nty (20) to thirty (30) m:tnuteJ abflpe appeared rouncla eize wu that ot a ailver dollarJ color 1 wbi to J onl7 a ( 1) Gbeerveda. DO aero d,_llic feature diecerrd.ble 1 DO tro.ilor ulnu.st ar propulsiOD eJBtell obaenedJ it ap~ared to be auapended 1D the a1ra DO eonm~ . approx1-to~ 1.0 accr~ the aky 1D the tonty (20) to thirt7 30 l!dnute period. lo unua1al feature notiood. Altitude eet1tatecl at 20,000 teet. Thia waa baaed upon compariaon with a medium type aircraft. Obeenera nre aU railJra7 emplO)eea t;;Lth DO prenou. u~utioal uperieDOe. 2 cop1ea toa 1 GeDeral, Air Materiel Comnam, lfright-Pattereoa Am, Da,ton, Ohio. oloDel, ~/.I', Dlatrlct : DOWNGRADED AT s YEAR INT~RVAL. l DECLASSIFIED AFTF.R 12 YEARS IM~s&FlED. IMANA-May &0 10M cor'lcr Cy rlra"'i":l a ~traiont l ir~ poi t o" t .. e te101perature seale :~rcuJ'l e point o (mc~n sea level or ~tation pres~ur~) on t~e pressure ~cale, a~o r e<srtii'J tl".e "'eioht on t' height scale. >tCT!:1: t. If O:e ~ot~ndi'lJ r~ac,..es L'lll.,ve the 110 !"'b. level, tt~ to of tlte ~ou"'r."l.:: 1.i1l te plotte~ u!1in1 t"'e prec~ures inrticated in :>raeloe!s ( ) alone .,~ 1"' ~-'\a"'<l ~r1in. Tl'li~ put o' ~re curve ,.ill tltef' be a pressu~ten!pera- 2 . -~i~ ~iagr~ is in all physical respects equivalent tot~ Te~i grat:l. It differs frO'f' the TePIIi-1Jr&ll' i n that tiM! isObars are straigll~ and t~e dry-a1iaca~ics cupVed in tile fo~r. whereas tile isObars ~re curved ~ e dry-adiabatics straight i"l t~e latter. i~er~tio~laore . c u:~t~eio~tsare~r~s~ i'lte~ o :eo:~c~enttal ~ters. I' ~ dencte! ~i~": in oeo;~etel'tia meters. a'ld.z n;-; d .. ..O~e~ "ei-:h~ ;,. Jcoretric me~ers, tt-e relation betwee11 1'1 and z is. by de'- 'lition: . si~:~ :~c ~ca~ n~ric~l value of J is very n~a rly equal to ~8 ~s~- ~v-~r ic'l valut~ o( ~ ~..,d rare eau~l. for ell orac~ical ~Jrpo~e,, and t~ t-o u~it~ m~} :c u rl in~erc~arcea~ly. !D'd'.t-+--A ~"8' ~-T~e saturllted-adiallatics. and t,.,e isocletlls of saturated specific "'- '-"'- Jt--+~+- """'~,_,L.~;...,~ 10 J humidity are coTouted lly t he use o f the vacor pressure over ice at tf!fllller~ tures cel oN o c. Tnis results in an inflection of tnese curves at that t~r the rlia')ra"' repre!lents a,. er~y o' :/6 joulesf'll- Gas con~t3": f o r dry air: freeri"ln poin: of ater: STATION TIME STATION TIM I E.XPL-'UTIONS SOSARS nre tne str~isnt, horizontal l ines. T~e heignts in ~ters of the pressure surfaces in the I. C.A.N. a tmosphere are ritt~n in orackets ( ) De- 1o. the ~ressurcs on the left hand s ide of the diagr~ ~() tSOTHER~S are t nc straight, equidistant lines running diagonally from / t ne l e ft upNards t o the rignt. ORY-AOI~S4TIC S (i.e . 1 ines of eqJa l pot ential temperature, or entropy) ar~ the slisntly curved lir.~s running o iagonally from the r ignt upwards to tne S~TJR4TD-AOIABATICS (irreve rsioleJ are the curved l ines that intersect tne 1000 mo. isooar a t int ervals of 2 C. diverging upards and tending to oeco~ parallel to tne dry-adiaoatics . Temperatures ot t nese lines are giv~ Ml::Jt TY m1xang ratio of sato.~rated air {in gm. pe r kg. ) is represe nted cy O~$h~o 1 in 5 . Tneir v~lues a~re~r a t tne ~ottom of the chart. ll,l(' ots: , (in l ns o f gt-opott'nt i<ll ,. ~en) of ti"'C l~>~rs between tre lrv~l~ 1000 . 7CC. 5~0. lOO ar.o tS~ ~. ( i . e . t l evel! of t ne stancard s vn- NJt i c: c1.:;r ~) i :c; repre!t'"''le.J ~> r;.~-:-er~ ana a -:r acuat ion clon~ t ne t:tie!dl e of eac:~ lay~r. 7ne t~ic e~$~S ar e ~otained from the virtual temperature curv~ : ) t e~u~l-are~ rr~t~oc, usir~ any st raic~t tire as a d ivio ino line (Vaisal a s t:C:"ho.1). Tn~ .Oirco:!ion o f the OiviOii'C 1 ine s:,ould t::e CMsen suet. t~at tile Form: WRC 9 -16 t If I fs:uelaussfeseeteueefeleltftsltll111f111 tl I It I I Itt It I I I f I 1 t I