Doc 0000184416

o A /q 7 ~---1 ;z -?. I - I / / J .• -- -· .... -"""--·· ·~·-··· ....... ·-·· ·- ·-·- __ .. ·Pror,ross Haport on the Deslcn end Construction of S..i:d:-e;; .----- 1i?.!!.~la;y Apperatue on ~~;u\.:'controot under Contract • '.:'he first apparatus built was de.signed on the principle of o con stant tape speed of about per second with a verloblo 4~' dist~nco between the reoordine end playback heads. Tho recording hood was fixed ln position ond the playback head wes movable on a trook d1.lch v:oa designed to preserve the Alignment. The tope in the form of nn endless loop was carried licht low inertia pulleys, over~o 0.'1e of i.hich was flxod end the other h.svlng o sprlnr; mounttnr; \'ihich melnteincd a constant tension on the topo. TI1e sound quality wos fair. 'Iho loop of tepe of overall lene;th about 2 feet appeared to r;1vo sdequotc for periods up to one-lu1lf hottr. The overall ros~lt:J quality, ho~ever, was not by any means equal to the Ma$necord equ1.pmcnt. I\ 1 thouc;ll low·~r qll.a 11 ty amp 11f iers (Pen tron} were us od in this work, the main difference in quality waa noise inherent in the tApe and head system used. Consequently, a variable speed con3tont heod 9eporation devt~e ~as dosi.sned and built. The 'heads wcre.fi.xcd 1n position et the minimum dlstonca (1"). 1he endless loop of tape driven by a ~a3 variable speed LC motor, U:J1nc; a 6 volt storece battery. Sinco an overall speed of at least 10-1 desired with GOod torque r~nac ~a-s over the rsn.se, the use of o res is tenoe. ,in the f 1e ld \'iSs found to be inadequate. The des !red condition! .. ~ ere mode by varying tho armature rcs1stenoo and the field reaistonce simultaneously, but 1n opposite directions. 1his ~as ac~ompl15hed by e modified potenttomctor, fixed rcslstencc comblnatlon betwe8n the field and the a rrna ture. In this way, a 25-.1 speod ranr,e wo s obtained with torque. ~:ood Jhc ronf;O of deloy with t'tis equipment vws from ebout; 0.02 to 0.4 seconds. 'lhe noise level of the macllino r.as felrly high, apparently due to inodcquate all£r,nment and trooklng of tho tape. It become opporant thut construction of a hlf.hcr ordor of occnrooy waa necessary. It was decided to ~odify the f~gnocord recording unit by keopln~ a fixed rolotlonshlp between the bends ond e con stant tvpe The image is a digital graphic, not a scanned document page. It depicts a stylized representation of a bank vault door on the left side, with glowing blue accents. The right side of the image contains text in white and yellow font against a black background. The text explains that the document originates from "The Black Vault," an online database of declassified government documents, specifically mentioning the MKULTRA/Mind Control Collection. It also provides a URL for accessing the collection. There are no photographs, handwritten annotations, official stamps, forms, diagrams, tables, redactions, or visual evidence of experimental procedures visible in this graphic. the macllino r.as felrly high, apparently due to inodcquate all£r,nment and trooklng of tho tape. It become opporant thut construction of a hlf.hcr ordor of occnrooy waa necessary. It was decided to ~odify the f~gnocord recording unit by keopln~ a fixed rolotlonshlp between the bends ond e con stant tvpe speed by includinG moons for vorylnc loneth of tupo t~c beh;een the fi~ed rooord ond playback heeds. 1'\l:ts cP-n ue done by an arranGement of 1Smol1 pulleys, the middle one of which con be varlod ln dlstenco from the heads. In using this method, tho amount of tope between the he8ds ia the acperat1on of tho middle ~wioe roller from the heeds. 'then this apr,eretus was constructed and tested, 1 t wo s. found the t the 1ntroduo t ion of the a ux111ary equipment ,-/ Poge 2 in tho ncit;h.borhood of t~1·~ heotJs 11pset the 13h1old1m!. OJS tor:1 t~nd resulted in tho introduction of a fair omount of noise. Consequent- . ly the po!li t ion of tho heads v;e s r.JO(H t iod to the e:-: tent that they v:ero turned o t 180° so the t tho e.aps faood cech other end were a boLl t 1/4" apart. 1\ a hie l.d we~ inserted botv:ecn the heeds and a smoll pulley mounted on a shaft runnln~ in ~ioro ball boarincs wos USed to position tht3 tepee rfhC S~perotlon of th1B pulley from the hoods w!ls .controlled by a dial opernting o carrioce. 11le dial wee cslibrDted directly 1n delay in seconds. This device t1as extensively tea ted ln the lsbore tory end fol1nd to r;i vc, ;.ri th 15" por second tapo speod, nolsy v;hir.h could be vorlc.d bch;ecn o.o-7 snd 0.5 SE'r.onc.~s or seconds with ovoro11 sound quality approximately equal to thot the or1c;ine 1 :.1egnecord 11ni t. n1o epparfl t11s we s tested by means of a steady.thouaand cycle input from an audio frequency oscillator. The sound from the pteybeck heed WIHl exom!noC! end fo11nd to bo o:r adequate quality from the standpoint of wow, flutter end nolao. LJ. 1hls !Tlachlne was 1nntallcd in the letJorntorics of ~~ and t~sted extensively with ectuol subjects. lh9 quolity of reproduction sto8c111y end rapidly deteriorated end after several days use become co:nplotely 1nadequat~. h.xominot1on dlsoloaed the fact thot the mochan!oal rugcedness of tho equipment was inadequate for the uond1t1ona of use. 1\ small drive pulley ..-as constructed for The document is a typed page with some handwritten annotations. Near the top right, there is a handwritten annotation that appears to be a series of letters and numbers: "A/P, I, 42, 30". There are also two instances of the letter "B" written in handwriting, one in the top left quadrant and another slightly below and to the left of the main text. The rest of the page consists of dense, single-spaced typed text that appears to be a progress report on a "Side Tone Delay Apparatus." There are no photographs, stamps, forms, diagrams, tables, redactions, or visual evidence of experimental procedures. letJorntorics of ~~ and t~sted extensively with ectuol subjects. lh9 quolity of reproduction sto8c111y end rapidly deteriorated end after several days use become co:nplotely 1nadequat~. h.xominot1on dlsoloaed the fact thot the mochan!oal rugcedness of tho equipment was inadequate for the uond1t1ona of use. 1\ small drive pulley ..-as constructed for use to tho .. standard !ra.cneoord equipment \":hich would perMit a deloy of 0.:3 sooon<'la with the 7-t/2" per second tape speed for uao with the subjects o hew epporatus ~hila was constructed. It ~os decided that tho dlff1cutt1es encountered in previous designs could boat be AVOided by using o verioble tape apeod with the s tnnda.rd era so, record on(1 p laybs ck head. ,e s ae!".!bly of the ;.rscnecord unit. 'Iho standard :;1otor 1.11 synchronous· will be uaod r·a:~necord w~11oh to drive a dl!!c at variable ctstonoes the o:xio. Thns a or!o;e fror.~ free from wow should be res11zabl6 en~ with n 1-10 ~peed rsnce n tope Dpeed of ~~~ to ~O" per second r.111 bo obta !noble Trhlch tvill e;ive 9 side tone delay r ro'l'l 0.05 to 0 .5. seconds. 'lhe ;:ecnocord rocordinc unit has bc~n completely :)~_::;mantled end 1s bo 1ng :o~bn11 t tv1 th theoe. mod if lee t ions. 'I"ne standard ;(.ocnccord endles~ loop tope d~v1o~ ~ill be used. It holds up to 600 foot of taoc ?:"liah m~Dns tll o t the teoe w1 11 bovo a lonr..:; life • 'l:,_ls desicn, e cf· course, !luffors .from the ;.11asdventago thot permoncnt record of t<1e test of tt1c aubJect is not obtalnod, l'ut it is felt tt-:ot the advsntogo:J v:ill compensota for t1.1e neoesDlty of Ds1ng su.."t111ary record ins eqnlpmen t. 11"l.o Motor dr1 vc ls presont ly be !.n~~ o saomlJ led. tiff loul tics have bson encountered bee a u.s e of tllo neoess 1 ty tho t the driven disc bo free floating. ()f the unit within Compl~tion two weoks is oontemplotod. C--_ ~-.- 2/24/5:3 This page contains a typed report with two handwritten annotations and a date. At the top center, "Page 2" is visible, with lines drawn above and below it. In the lower left, a circled "B" is handwritten next to the start of a paragraph. At the bottom left, the date "2/24/53" is written in cursive. The text discusses modifications and testing of a "Magnecord recording unit" and other equipment, with no visual depictions of people, locations, or experimental procedures beyond what the text describes in technical terms. There are no official stamps, forms, diagrams, tables, or redactions present on the page.