BSTJ 10: 1. January 1931: Abstracts of Technical Articles from Bell System Sources .

1.6 MB·English

Abstracts of Technical Articles From Bell System Sources.

rt Loud Seater ot the Higher Avie Rreguencien! La Ga
Hosrwiew. This paper eerie aloud speaker desiewed fr use ase
sdfunel bo exiting typos for the plepoar of ecranding che range ot
ftictect pevSamzance to 11.900 or FR ryrles 8 mewing el ieton
ftiagicagen servetse is azed fa eanjumction wath a 2heyele outa
fspoaensial hoon having» romath cEametre of abone 2 inches. Mo
fional impedance meapnrewien son Ihe ie siberian
ge theclote eck of ulna 20 ye cent il femur ce
one 3EE6 to TID eyes The variation in reegoner thin this
hand doesnot exceed Sa. iy using a high-eruency ul speaker of
"le lym the eiceney and powe: eapacey of the estoratedlaw-lee~
quency loud epeahcr con 36 improvesl and a mniform eeeponse~ie-
"neoey eve fom $0 to 12,000 exces an be obtained,

Noite Surneys, Lett Le Soleo OntapDoors? Rowes

HE Gace, “The parpeee of 9 neive sara huaity a shel the
iii and tite disallbucon of noize insensiey, the Frequency composi-
Thon al the mise, the contusions of vatieusncie cows 30 ceetion
bhabween the annoyance etfor of te noe and ste physical end acto
havacteseties, and tke etetiveness of mechide of mele reduction
‘The exteat to whic eee: of tee phaser of che noize promlem Es boos
inveripatdhewrefers. fa gw sior she pn veo he
inven’ gal ed upce the appecatua employed, Foor one standpeint
2 enothet, any acible ssurd ray fell within tho category nei
heace the vaviety of possible nese survers fs alcostunlimiced, Not
say such et-ve¥s Lavo aeen czried cut, aawevet, partly becouse
appropriace aposratim rae sdeqenen er eae y sande
fompasison been plished Hewes the relief aillene
lat rd ish € Mere ietscente. Tens herene ee ult
lie iw ssnemite such previewesy aualeked vesute as ate avelate
aud cotaln now c>stivstion. is “he present sits of papers oF which
thes prper dela with ieacntaf tec

esate of

Keoptanis ‘ion ix Toopoose Trosmaiters? TS, Gansu.
‘ais eomi-tecanical article gives & Lrel resurab ofthe sheores of mcr.
Shosie retin and describes the seals sme experi hs
fonleul Lelasiny of granular earhon of ehe sppe weed in commercial

2 technisor ie cherie wleretyy cnotasts either singly ot in
srvarse—mary bested nly start Tia of Ce onde af 1 deme,

"Threogantudy of the temperature ecetictenss ef recite af euch
‘oat ix ysl to eaneude thatthe conducting postions of he
oml jwelien sae af ie au of earbon and that new contact
tints are evtabished of Rroken when che resitengs is ewe
rrowrahe reistenre fee: eyele

“The experiments sv Tha for euch reversible eveles the relation
‘elvenn the reuance abd force ie of the aporowimste fom
R= Kivj~ The exponen. vases cons'de-e5ty from exele wo cycle,
Inn ites vue Copendta a che force te, The largest valaes
fof are obteiued mith che aggrepran ct ris mer schema ae
fof face litte that the elsaie eran net ae warily Tare.
rcximim mean value sulstaatially indeperdene of the force limite
‘gouge ly aroninaten the value 222

"This vise Tia tle unr ive bya tery conta eects
worked out by F. Gray, assuming that she comtat is made Betmect
Trevi antag mateiet hex ingwinfave rusbcees valent
iran een euivateplivea bila. Os gocouae ofthe elaticiey
ofthe material bth the saieroseepicarca of eontave tavern these
land the microscopic areae of eontece besten fe il inert ith
contacs fee, A seraiced aggregate of granules drerefore be wade
To beta ike ie angele Lelween pliers having a rug

surface
‘Por sogle coneacts und for sogreytes at aml sans che value at
fais elem ch nirvry wea 14 olds Fs Aconuntd for by theory
This
the cic measly insensitive bs changes ia the applied force
‘The enlace wf euhecon fe veadiy demtoneteted ay te face that
contacts abwaya sequlie & faite fosee te break them even whet
‘assent aay passed though the conte,

saroleted wits ger coat freay er ence, whi render

Lhe Architectnve of Lining Coir Recent Adowwae ts Methods of
Bioogel Rescreh—Opsiest Setiotns elk te ina Vint dtr:
tgges TT, Lucas. An previous papers of Vie yuck Tew yesie the
evelopment ened eppliatiry of che nlcra viet eeseaeope eo the
tefence of mello Poe Tew ese

‘Mesllograiy, Get. ough, shane whl waelared. ro hie
tology ov ata Drabebes of Eolngy bus te two branches of sence fo
have many points in common. Both fal in the lst analysis withthe
stustuse of macter and, in each, the niieeasonpe i an indispenseble
ool. Improvements in micruswouic visio whieh enlarge the world af
‘sion i one Bean of acience inevitably havea eellecon a the other

Te isnot the purpose of this paper to wale nto-a discussion of seus
bres of ving eels as revealed By the lie vole wicnnne. More
tntdiulaly, the object ie to present a Lol for bloga! research; =
tool which enabive we to photograph Me staucture at difleest panes
levels wich & ingle ol ws group ef cela: one which czables us to ace
the living cell wit a degree ef puccsion and elaity noc Eeretofere
possible hy any «her kinon meas and with e potestial reselviag
ably a ast rive hal of te het apacheomatie ston: using vibe
igh.

Production of Pastis Molded Yalephone Pars A. M. Lywy, The
Western Electric Company now manufactures for Bell Syswam 25+
srs lage number of diferent phenolpastic, shellac, and hasd
suber molded pars, the wotpn! of which varies from « few thousand
‘tp several milion per year. ‘The rerty uf the molded parte are
produced in comparatively small ques, but certain of them such
5 che phenalplst maléed parts wad in Cie handel (ype of tee
phone, a nee molded subeeriber's wet hang aad the reover abel,
‘ap, and moutapiowe used un the older type of Gekestand teeahone,
fre heney-ronmiyg acts. Te vane aad pre eenipment wat the
Drovtoan wf these para are deal Ui per

Variation ofthe Sntnctance af Cite Ope tothe Atagnatc Shitting
Lipet of Faidy Currents se tie Corer KT. Scat. Am analysis ix
rade of the eilding effort ofl eurentsom the xin the inteiae
Dl nares of cylindrical or at het aerial. Tt iz shown thae the
feounter voltage of eet inductance of an iron-cored coil is due only co
the component of Fx in the enre which is in phase with the fs
the surface of dhe ere, Expression ane blaine and curves plotced.
showing the varioow af induehsrae wa cul with frequency, or wth
the conductivity and permeabllicy of the core siaterial. Sample

eulations and some experimental results ate given. The reals
thom shat che indctascea et High Lequetcios are actually len han
‘the proiceed values, whith leede eo she euapicion that some. Sartor
dother than eddy currents ceuses te Os fa the aceon of Ue pares
Cdoteaee with ineeasingfrequeazy.

He Pa
as BBLL SYSTRAE TRERNICAL JOURNAL

Recults of Noise Suneye. Part I, Moiee in Buildingst RS.
‘TcexR. Noise experienced indoors i in ome sense more important
than that experienced outdeoss, for, with the gronth of eur industrial
Civilization, inerersing number: of people are spending most of chee
‘waking hows ioc. They are the mere to elnino for a
Tange prt of the silting te Har er hen nee a
portunity to Inpaie their working efficiency.

Certain typical vals for vce it varia Ieee i bigs

Fave en ulin al ne roma hi pes Oe I=
felge of indoor scot levels Car Grom compete, howevee. Further
Anoronacen hes bee sina Sa survey ef enn ne it New Vork
icy and he srceaingare hc wa mead in 1929 by the National

Elecerie Lighe Atsociaton end the America Telephone and ‘Tele
fzninh Company inthe course ofthe work of thei Jone Subcommittee
fon Development and Research. Some results of the New Yoris Cty
Sreonrements ane given. Abo D0 cst lective ae ince. TL
sll be relied that this is omly small sample of the total mabe of
‘sees where indooe noise is experience in New York City alone. The
frelon piven mat therefor lar ean rly a sggestive rather
Ahi baling te ay gee ee
Fo, As So, Ar, eh