BSTJ 10: 3. July 1931: Abstracts of Technical Articles from Bell System Sources.

2.2 MB·English

Abstracts of Technical Articles from Bell System Sources

4 Land Spooter Goud ty Tasks Thrnsand Chiles!” LG. Rosrwes
A oul speaker, designed for ue a an adjuneh. tw eating type of
sealers to yertaitellcient woud saistion at dhe higher aul
fimenciss, iedescibed. The structucl and pecfovinante character
inten are indicated. ann snane of the advantages aud limitations of
scl loud epealer are discussed,

Iudcating Mover for Moasorement int Analyste of Naive? YG
Casisiat, B, Davin, GT, Srastox, and RS Tuckes, This
paper describes a visuel indicating meter for the measuremen= of
‘ire od otaer seus. Te designs bed om the kon cara
jsties cf sound ard hearing. which are suramarizd. Parsicular
‘azension haz been paid to the respence of the meter co saude of
Short desation, The rt has boon t rake the meter both simp i
fpertson acd porsable. An attirkmere for she Feqienrs analysix
ft noise ie wader development. Several “elde of ust of the meter
Sane aralyaer nee fit

Siar Agpiecions of Belb Soon Intrumuntitios ad Proce to
Ruilood Convocation Prolirnss! Re Ac Canes. Rallis! conte
Truninaios problems nrefardarentziky similar ro those encnnteet
the Ball Systers. Ae s real, she inteamentalies rd pres

veloped for telepone company ub are, va large extent, applicable

oil cimpeony nee. Sata Be [Suen meatal ie
reve, thereore. fuer siule available tn the raion) comes,
Likewise, iy meane of repmeseatation on the Asmeican Ralway

‘Assorsation committees and by participation in conventions and joint
Siseusions wherever practicable, infermation regarding many ef the
rove general telephone sormpan prachees has been inearporated
the Iesiway Assrintion eles

“There ae, of wourse, some enuifons which see peti tell
eperating provesare oe plant. In these canes exiting Ball Stem
Snetrumentliies ave len tlle for oe, ew ease st
{0 the particular res neue fas Twn evel. Catalonia
pers isting and cescibing this special equiaaeat, together with

‘ike it ae My 8
Insteuctons reasling He uee and manteranen, ave been oublished

Cerin cleans ol equioment canst fe readily foeated on 9 general
tusks tad epecine sess of elividual eases are require (insure
fective applistion tu she rails use. Where seh esineat i
Fequested by the raiirad ciemonies the tlephone company under-
(kes the secesnry attics nd Foetahes the apperstes to thera
snpates en a real bass

Extesive use has been male of the vasious Bell Systm serves
he raiload companies. Tamms of the more general applizations
ste: dispatcher and. way sation telephone sets, salector signaling
Spparatus, privaie brane wxrtanzes, loud spacing equipment, cable,
telephone repeaters ind leading eal

The Call Anwnmiers A Tileprone Application of Sound Picwre
iment 0, M Gres, Eunchmensal recarel and development
‘work wacred ou with @ partienae lective in one fl eontsibutes in
Yhany cos to the solution of jrulens in ether fields, A typical
saa the eapueatin of fhe sound reproducing elements, deve
Cpe or use eimai Fr our tare theacer reprcing stem,
in the solution of am “urea pagblem ia teleshone sytem nperation,
This arc extn 'ecranzunizatiag problem which we presented
and devribes te appavatua whic: wns developed, exipoving adapt
ome of send itt riclptes coset the ee

Design ond Fesintiow of oH Cake Se sie Bel Spates Gums
Tatas, This payer dieciice the prmene etetis of te toll calle
nesmrs of the Bell System, ivicates glans for it extension ec
Cleverley recent jnyasvements in toll eb, including tape cemomed
tabie, loading sul sid teehee repeaters, Preset mainenance
Ihethods for ell cable reve ate also deel weth.

A Repid eth athe Signad tn Nie Ratio of @ Ligh
Gi Keceeers TB. Lazwenisn. Te shown that tyre of
nevis forthe sia ianisarasio faa reewiving system is obcained
directiy by noring, how auch the total noise lw inreages when
the inpat citeuis tum Ugh resonance ie abeance of egal
‘The efit i nismiching the angen a inp secu impedances
is disease, ant tis onluded that slehught a small improvement
say be olive i certain ideal eer y making the crates
fichier than the smtenioe inngedance, other eonsieatinns
indicate that the matched impedance condition gives the best results
in practice

The World's Afost Powerful Micescoge ¥. F Lucas. In th last
ten years chere ts been developed at Hel) Telephone Laboratories
new technic of high-power micrography, which bas greatly extede
the limite of eel magrifienion presble with a rlemarope. Since
aay entenscn of the Tints of seagieaiiam of the mieromope wich
FS secumprnied by deere in eleiton fs ules, it moe fel
necessary ta snore the reli, puner ne deiniton of the mic
Scope One sey whic thin eat ie deme be seers the
ee length of the ight ted

A micrnnpe sing neraviolt light was developed ah: thi-ty
ese ag by Koehler of the Zeiss works. Dye to varowsetieties
invuoersting i, this miewoseope econ became a sienibe eurcscy al
tees alent fongtton. have Rew yeare ag a rsiemerrpe af ths
‘se ws vlttnel (rm the Zeiss wures by Us: Laboratories, andthe
‘lifextsies inal in she use of this instrumeas were largely solved
by she development sf s mevhenieal svernod ef feeus:tg. With this,
avienecupe, ite prsssle to obtais crs, orlisne images of Tet
Tings spmciment magsifee SM to ODN eiamenees In studying
te advarteges el Pts of his microg, Ht wes nun tbe
pa-teesly epy mae the sy of blag and metic ee
mens. Suc speimene cay Ine vam at high maifenion eer
the usa vilet mirwoseope athens the rosesity of retin, staining,

A Dinct Resting Aniio-broqoncy Hiase Astr* W. K. MacLuas
and LJ. Sivi8s. Tn enraecrien woh eertin acoustic stes #2
Aesiel to misma sand presires as vestry, he, to determine beck
the anmlitedes sad the pluve angles. An exarle, more fully de
‘eribed st the end of the paper, fs the messmement af he amit

and phase variations ia the ywessane al sirius pins i reo
terete by a tone from a loudspester. Ue mitra Irvaren
pith in the room the amiglitire and pia changes in its output
{oleae are equal to the cowespading changes in the cml essa

‘Thus, the measurement is relied ormn eerie erp for the
lsulute elibration ofthe microphone aad assented eletcea seul,
‘Atanyone frequeney, relive ebnages of aanpitse and phase wich
posision usually are all tha i of interest a which esse ne alivation
Formesion af Pholoumphic imexes om Chudss of Adbali teat
foie Cella AW. OkMN and G. R. Seuwiit, A meched
ive shotograahic images on she
fathedes of aan awl sodium photoelectric cells im vacuum
tdeccribed. These images are ensrp nd elur in every detail und ean
hie premanenily "fined" by proper treatment. Amon the materials
which have lire surcrsfully uci ueating the exposed surfaces to
bring out these images ae supiur vapor, ar, exygen and hydrogen
in the rain of Y 40 t. Dydvofuodic acid nd bromine During the
time the frag is Fring, the plotoleceisseascivicy of the lui
pate portins decresses approximately 80 per cent. Aer the image
ie aud ae a permanent record there is litle difeene betsreea the
swoitvity ft the eathode arse bearing the image and neighboring
reas, Photographs of photeleerric mills are shen i whic such
photographie images are plainly wile,

ri
‘of mm Ith uegadive a pos

Anspschsstrome fet parle Rinetstungen, so don die eine i
der Lice lig? and woenick long it Jous Ramos. "This paper
five the firm fr The wie foe i a homogeneous semi-inéite
fla er crt hse easel eer fo time ese than 2e"0, sity
for time yesater that aeto) in am innive wire above the weet. The
sonrsponning focauce for the eleerie forme iv he ale. due to FDL
‘Murray, has been published in the Beil Syste Technical Journal foe
Ostaes, 1940, equacon (2 of 1. C. Pelenon pe; te wo Form
agive at che stiface of the earth The arent farmuta fa given in
Tite orn: iv cecave ot the exponential furctior an the etre function
complement

A Moteen laioriney foc tke Shaky of Sound Picture Probleme"
‘TB, Sia. Reewntly there las heen provided among the research
focilies of Rell Telaphone Laboratories. Ine, onjarate balling
‘which fe fev solely for soa picrare restarch and slevelopmnent
Spork. The prin objec ot the laboratory are fr wat the best
Iethods and tecnie fer employing vend picture recording and
Feprinlucing apgacatas aow in ues, aid of icing improvements ia
irlingstal rnaselucion, ‘The building contains recording studio,
film pronesing past, aad review room, eter wit cating labora