Marshall County Republican. (Plymouth, Ind.) 1856-1878, 1862-07-31

"Its spiral fanges stiffcn the rod aud the rough
edges dissipate the electricity and therein is much
better than a smooth surfsce-"-DR. BossToS.
"rhe open Aanges running spiralIy the whole
length Of the rod, enable the fluid to freely ira
verse both surfaces and at the sine time pursue
the spiral course natural ~ its movement. "-PRos.
BUCHANAN.
"when electricity is communicated to q con
Quoting body, IL does not Distribute itself uniform
ly through the whole mass, but exclusively upon
the surface. "-DaarrR's CHEMISTRY, page los.
Cooper is little affected by exposure, whereas,
iron soon rusts. and in few years ceases to be q
conductor. "-BExsox's ESSAYS.
A correspondent Of the South Bend { Ind Re-
gstcr Of recent date. says the franc dwelling Of
Nathaniel Frame, in Warren Township, Sc. J,,-
scph Co., was struck by lightning. The rods on il
we're square iron, in pieces, connected by burs or
nuts; the electricity Jeff the rod ut the first con-
nection, and passed into the house. doing consider
able damage. During the same month. the DWELL
ing ofD ! Bloomer, Of Peru Tp.. same Co.. was
struck by lightning. Its rods were Of iuted iron,
connected By burrs nuts. The lightning left the
rod at the FIRST burr and passed into the house,
jured Mr.. Bloomer and wife slightly, aud damaged
the house to an extent Of 800. Mr.. Witter's
house. N German Tp.. ST. Joseph Co.. was similar
~ protested. CD and being struck. the lightning
len the rod at the third nut, and seriously damaged
the house. We have numerous instances where
buildings covered wi h iron rods. have been inur-
ed or destroyed BY lightning. The School Board
OF keokuk, Iowa. recently decided to take down
the iron rods their central school house because
Of their iaefhcieLcy-the building having been
struck by lightning and materially damaged-and
ordered the erection Of Munson's Spiral Copper
Rod. We learn that notwithstanding these facts,
the Iron rod pedlers are busy in certain quarters
circulating the most outrageous stories about the
copper rod. We caution the'public against them,
"When the building is protected BY Munson's
Copper Lightning Rod. FIVE per cent. may be de-
Iron Rods"-FaoA RULES OF INDIANA FIaE In
suaAScx Co.
"Aetal should display as much surface in lateral
dimensions as possible. consistent with strength. to
reduce intensity Of action on the surface and heat
ing cfRecS"-ArrLEroS's DIcrIoSAar OF MEcHAs-
Ics, page 40.
"lron. on account Of its low conducting power,
Is more easily melted than copper.''--CrclorEDsA
ov UssyvL Axrs, page 557.
"lti well keown the greater the surface of the
conductor in proportion to its the heavier dis
charge win is be able TO conduct safely. For in.
stance: rod which Is 81 times as wide a. it is
thick. win conduct charge about - per cent.
greater. without being melted, than . rod which Is
square and has the same cross sections" -Mosxs
u. fARNEp. ELEcrR,cAL ExGixEER. -. a,tr
"The efficiency Of Lightning Conductors does
not depend SO much upon their power 10 attract the
lightning. as upon the power off point 70 draw ..
way nsensibly, very powerful charges of electric
ty from the electrified cloud thus preventing the
descriptive discharge."-PRoF. SrLLIxAx
81 would not hesitate to commend Munson's
Nod to all who wish perfect protection from &C !.
eidents By lightning.-Pacs. BRowS or THE N.
W. Z. UNIVERSITY.