The Daytona daily news. [volume] (Daytona, Fla.) 1903-1926, 1913-03-05

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ing Try nz< Eu1dek % lzsd and -
that are neFex toncned br humxn nzrssx
<rum one Dou<1's cd - z1e<ter TIE
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e<zmeuf. fhr1axh - zzx1fzrpuse bozrd
has ufzlined tbe Services of - xua zn<s
made rzzf srezf lamp q As&xen
zzzt1fHl sid aDersng servant q nsem
interesting
IL E2srove~y Ct zes<y5zze <zs Ezs
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Keepers ~ So lite nzszf4 IN <1rpE
psseez A1fseru nzRx1r zzs ngf ssDm
= recognizing tze Szrf Fs1zr k1y - -
pszEarzDn o. xezzz1n wess kmswa aess.ss-
fszle F,rsnEspses tEae MzEsEznx IS tgse great
czzzsns q svsz<szs fhzt gsTslse tzse ezzsss
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TO great szkes and e~erv EaTs@4sss
x<regsn n gzzr au-e eeunzxv cnzsa =
zazfh siznpsi Eesk
Tie Ensres S<aseS did nea became r.
kereszed IN the scesyaene agnF ard II
systematically sezerzFSng gas bngg Hnrz.
sis0z< liz PEAR 1856 aEsI Cid not assosa
6 unkzI 1sssS Then the engineers 81
the lighthouse bard devised ssozsE
wonderful improvements. zuong Fhem
the utilization Of tae stu
The self sighting and self exxsngusssz-
ing sceFyIegse beacon =. ; Tery Simple
thing but Il depends almost en1Iresy
On the -suB vasTe-- which Is 0re 81 the
most wonderful bzf Least complex u
rne achievements Of modern science
In the Grs1 place. the s0urre q Et-sf
for these soae beacgns Is dissolved
acefysene. which : stored under pres
sure II s1eei cylinders One Of these
cylinders can be charged with enough
gas to last small beacon three years
Usually. however. IN the case af Scat
ing buogs. SIX months supply Is al
that Is necessary as such b0ovx are
oyerhaused and painted twice year
Knowing the size Of the fame znd a.
hourly consumption o. gas. Il 5 very
easy 70 compute how lgng 3 cylInde-T1sl
vii last and hoT often Il vii need 20
be visited That is al the care Fhe
light will need TIE sun valve dnes
the rest
The scientific principle upon WHICH
the sun waive depends - that light
waves become Transformed II different
degrees. according 70 the nature Of the
intereepting bod Sunlight upon OARS
surfaces il converted Into heat and
heat produces expansion. This expaa-
sion - especially pereeDtble IN eertaln
metals
In a carefully sealed and substantial
y mounted glass Jar nearly fest
high and about one-foBr1h that II df-
aEneter thick black rod Is placed per
pendiculariy through the center. L Is
I supported b. three sleuderer rods 81
highly polished copper The big black
rod Is Of copper also and Is coated with
lampblack 70 make i absorb light %
/ the greatest possible degree The sup
porting rods reflect light without ab-
/ sorbing i and do not expand or con
I tract 10 the same extent as the largest
/ rod
+ The thick black piece OF copper IN
J the center Of the Jar Is extremely sen
girive TO light and heat IS the Sun
+ appears and the atmosphere grows
warmer IN the morning this rod length
- SIS -
+ chamber IN which the glass far rests
+ and touches the end Of a lever Il
presses down on this lever. which is
controlled By spring and cuts Of the
a0w 0f the gas 10 the lamp.
When the sun disappears from view
+ IN the evening and the temperature OF
+ the air falls the process is reversed
/ The rod contracts ard releases its pres
+ sure on the lever. allowing the gas 10
fio'E upward TO the lamp. The gas Is
I ignifed By little pilot fame that :
never extingulshed Thus the beacon
IL lighted at the proper time and IS put
ont when it is no longer needed. al
though along desoIate coasts il gay
never gladden. the human eye ~
months at a time
s The engineers Of the lighthouse byai5
I say that the precision Of this device Is
/ almost Incredible II can be used with
/ equal certainty In equatorial heat ana
I'm polar cold. for it responds with the
+ utmost accuracy to small variations i
/ temperature. Il Is used on lonely Is
I lands in the Pacific. There are nearly
4 hundred Of these sun valve beaconS
/ ID Alaska. In sumner they are aids
to navigation. and Ia @inter they guide
the travellers on dog sledges over the
frozen wastes Harper's Weekly.