Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1916-09-17
LAMP STANDARDS
ARE PROGRESSING
Many Experiments Made to
solve Glare Problem:
Eliminate Focusing.

u. r tt.---- p.s-.t.. that the eE-
tl@-f4' ~u-s EYs aers done hy
-.- "-"s'~ez. -l- gtL.Lt -lF-slO1 q
-'s A. = s-4.darcg committee may
.--f % e. great r-t 4rtlrr %; glare IN
rf1t.--ps ar- also IN TIE elimination
% 40 f1.- -lus 1s.lCss. = focusing de-
...e crly ar I'd. ..stn1e-t 90 counter
-r' ne .A eff O. Ol .aae.-fsfe reflect
.-s and amp bulbs ENpe- meuts
made - Sel4 Far. Cleveland. oy r
r -rrrIttee of tre division some
months aR1 showed That certain types
- bulb 'l.4Er-It ard certain tspes u
reflector H.re .-s- sensitive than 9TH
ar- frat De- - +s -hey found j. pos
'le ".ff some bulbs and renectyrs
'. a.ler fte adjustment of the focusing
l- l.e quite cnr -fcera bis without az
'"eurs me nature or quality II the
Ight seriously
Another meeting held AZ Cleveland
i4ft week Glse. 4d the results ~ The
tests having aiI flu specifications OF
Do. best bulbs and rrflec'lrs tefOre
'n0u. and a-0ertaIned that il is pos
-Irie commercially so 10 make bulbs
ar1 rrfectors tnat any pair Will as
-rnule correct without individual
focusing
The essential with respect 10 the
h..h b. hat me filtmcnt shall bc truly
central within fairly fine limits and
fnr the reflector the focal length must
Do close ~ I Is inches W4th ii rec
Hector acrIftt" 10 form within the
limits of normal manufacture and
with a bIih just "a little more accurate
than iir present average and the right
snap" Of nlaWent no focusing IS nee
tssary
sitc Of Filamcnt
The committee or lamps reported
"a "a. I 10
whole electrical equipment division at
meeting here today and The follow
ing subcommittee report and sIP-
r"si.pnH were approved:
Tho vacuum bulb which was Sc
l''t'd as most practical at the tests
hti q nlamcnt IN the form of a helix
-.D MN. IN diameter and ~ MN. long.
III, raA-fillcd bulb which was selected
Z h1d "a shape filamcnt the spread OF
the Y being wm. and the height IS
mu. Both NJ these were ei2 amp.
bulbs
The National Lamp Works is max
/ Ing both O.. -ir. bulbs with flamcnts
located the same iu reference to the
haec l'Ilamcnta are located by eye in
manufacture. and the variation is held
within l-lG-In plus minus II jlgs
are introduced ~ secure more ac-
rurtc location the expense Will be
greater and tho manufacture slower.
II is possible 10 locate tho ccutcrs Of
Elements within l-Gi inch of the true
axis and within l-32 inch Of standard
distance from the pms in the base.
Figures viii bc furnished az 10 the
approximate Increase lu cost per bulb
DO they make the necessary apparatus
and perform the necessary operations
10 locate centcrs Of lIaments within
these limits.
The subdivision tentatively recon-
mcndcd that for hcadlamp bulbs the
center of the fildmcnt be located In
the axis Of the bulb. "A in. from the
nearer or locating side Of the locating
pins Of the base.
Vacuum bulbs are to have flaments
IN tho form Of helix AZ nm. long
and 3.5 nm. in diameter.
Classified bulbs are to have fila
mcnts IN the form Of a V leach leg Of
the V being formed Of "a fine helix 3
nam. wide at the base and = nm. in
length. The plane Of the filameut Is
to bee at 80 deg. from the plane OF the
locating pins.
These tentative recommendation
are To be- tested ont under manufac-
turing conditions by the latter part OF
November, after which time the final
report can be made
Rcrl,rtors.
Tho subdivision recommends that
rcflcCtOrs bee made as near as possible
90 thc outline of true parabola Of
- in. focal length. The receptacle
shall bc located coucentric to the re
flcctor and $50 that at the central point
Of adjustment In the reflector the por-
ton of the hayonct Slot where the pin
comes 10 rest shall bc 4 in, from the
focal point Of the reflector.
Investigation has shown that practi-
cally all makers of tail lamps are
using glasses having nominal di-
nmctcr Of inches with tolerance of
minus LEA and plus 1872 in. 1t is
recommended that these dimensions
bc made standard.-The Automobile.