Jerome County times. (Jerome, Idaho) 1919-1920, 1919-11-13

e
,t,i,lirl In nscortaining IN general way the loca
zion az 81 shin al sea-. Toward the end OF the war
the device had been 81 perfected that II was pos
sille for the microphone listening station 10 car
culate the exact position of enemy guns "l'eI n'"''
Ing tho shots The speed with Whl'h S"uhu '"'
els was of course. known and served as n"S'
Of calculations az different stations. WIN th'Se
Instruments electrically connected il was poSSip'e
,n record tho, exact time at which the S'uhu
reached them and then by series OF rather III
tricair calculations based on triansnlatoh' !"
locate the object
The rcorhouc is based on the same prihcipe "S
/ thn uicrolhone. excepting that SOUND waves are
recorded from the earth instead "i u'e AIR. "".
3, no. reached such high state of development
| under engineers Of the bureau Of mines that II
lfl. f,ir to ~. one Of the most useful applications
n.v h.in. made NJ inventions due to the war
ceopnore Is seismoeraph
The gcoI hone though small is essentially a
s.is,norraph since it works on the same principe
49,, .,ior,,,s ,,nunrntus with which earth
,,.,, ,r,nors are recorded. II consists OF an
to-, ri,,, about three and Il half inches in diane
Gov ui,hin the center of which is suspended n
land disk that is fastened 10y a single holt through
,,o mica disks one of which covers the Top anu
,no other the bottom Of the ring. Ihere are 'Wo
hr,ss pirccs. the top one having an "p'i""s j" 10
,,,.r in which is fastened rubber tune eau'ns
la efpfhOScNflC t;IIN'''. '"'N ''
Fastened with bolts 10 the iron ring ANA S''N' "''
IN hold the mica disks in place .,..,
w. ,h,,, hnye really nothing hut n lead W''E"
t, bct,y,rn two mica disks cutting a'r"s
,,,,u nir-ticht box. If the Instrument i p"'.''
NJ, One ground and anyone is poun'hS vi "'S-"'
e Ia ia. vicinity energy IS tralsW''" az W.
u" Wv ., ,hc carth. and the earhwaves shak
'u"'''" ,,., .,., The lead. ON account OF II
= watch, and because It is susp'hd'u '''"v'" ~
,.rs remains comparatively m"u"'''S'
l. , ,nen is rroduccd relative motion n''"r'
49,, Instruments case and the lea" N''S"
.,,,l, Is that II compression ana r"'''a.''o' y
d 49,, mir in the instrument takes pace '''' !"
y r,,cr Tube leading to the St'th"S'"P'' va ~.
" '"''' ui,h This space in the gcophone III
l. comm ',l ,o,nnrcssion is carried to the ca
,,,, TsunlIy two instruments are uS'" o"e ~
each ear. 49,.
uo,v Direction Is Determined
II ,, Instruments are used, il has bee
II N"" Wv ~, sound is apparently louder fro
II '"""' .,,,,,cnt nearer the source o' inc SCUM
II ,.' ,,.,,n, then that 10y moving the 'hS'ruhe"
II .n..rlv Il point can be v>und ""''' NV '' ~,
II lni h, of the same apparent W'nN"' ~ W.
II l.h, direction Of the sound Is inc" y" " ~
II ,..,i,,,l,r to the line connecting VI"
II p'"','' ,,.,r,mcn,s either I'm front OF or penn
the two - rurthcr observation Will she
70 inc ,1 Direction is quite accurately
WIN tn this wnv The sound Is not "c'u"
' ,,,y in one ear than in the other pu' tn, , r.'
'y .anohlc " distinguishing the H'"'.' ,s,rrn,o,
ok ,,h ,hc sound arrives in the 'N' ",' ,,,,
~ ,his is the cnsc persons VIII" "'v ''e
,.nt I'm one ear are said SIM ~
be "'"' ,,rcction with the Instruments
olr i'r'n'"' ~, nor,od Of the war. engineers oil
Iu''"N ,',.,a,, or the bureau of mines we
'"''''"S , In determining the distance u,''' u'',
ire ""t t mining machines could be near" ' Mensu
rs cl"v shae. coal and the mine nerry required
mt mcnts we're made also oil Tue deenite distan
order that they might pe a mr, as well as to