Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-09-30
Protection from Lightning.

TNHE undersigned, being the duly appointed Agent If
SG-RoD MANDATORY, Covingon Kentucky begs to offer
these superior Rods of Spirawsted Carbonzed Annealed
Iron with Ano proectors anu Eecsroposnse elements
to copper conductors They In tenee lengths with
brsssscrew connecting joints an entire
frame buildpgs ALSO glass solaers OF novel and inge
NOUS construction atentcd forming lock; the whole
mounted with solid platinum silver point {patented)
twelve inches long, surrounded at the base with three angu
lar negative magnets which the power to extra
most fearful thunderstorm and embrace the entire perc
ton Of science to tho present me the whole consitu
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not been compromised by aording these
ceent rods at such low rates the greatest attention has
been given their construction be readily attached
The astonishing of the negative magnets in dscharg
ststa s bv Che a. when nous
have shown but slight results though placed under the
same conditions In fact they gather and silently discharge
electricity from the atmosphere when you would scarcely
suspect any being present.
These Improvements being secured by double letters
tent you hereby cautioned against laying yourselves
liable by purchasing OF those who not authorized,
who substituting inferior limitations All agents duly
appointed can show their cerncates Have good rods
none, CHARLES w. HEfDON,
Washington City.
do hereby certify that have opp lied various powerful
chemical reagents to sprstts Patent Points for Lightning
that they will resist the action Of atmospheric causes and
thereby preserve the extremity sharp condition most
sentia protection against lightning The reagents used
the above experiments solution Of chloride
dunn common sat acetic acid uphuric acid hydro.
chloric acid. With the FIRST there action the
meta with the several acids there very sgh-a fact
sufficient to show that atmospheric influences would have
sensible effect.
UNIVERSITY OF Ga, October 8, 1850.
The Lightning Conductors Of Mr.. sprat offered to me,
are well calculated to perform the ONCE for ghieh they are
LEXINGTON, Ky, February 20, 1850.
CHICAGO, September 8, 1850.
This may certify that have examined, somewhat criti.
caly James sprafs Patent Lightning Rods and that am
Of opinion that II Is constructed scentiGc principles Fer
combining durability cheapness, aud efficacy, deem il
equal and think superior to any other rod offered
for my inspection. Prof JAS. v. 2. BLANEY.
AUGUSTA, (0A) November IL, 1850.
This will certify that i have examined the Lightning
Rods, Metallic Points, and Isolating Attachments,
featured by Mr. Spra and regard them constructed in
conformity TO the general laws OF the electric fluid and the
metallic compound constituting the Points, promising,
the result Of several tests to which they submit
most likely 70 corrode them. A. MEANS,
Prof Phys Sc. Emory College, Co., and Prof. Chem ana
PbarIn. Medical College, Ga.
The Lightning Conductors put by Mr. Henry NJ Smith,
OF this city the plan OF Mr. sprat appear 10 me TO be
very well devised and In point OF mechanical construction,
are the best have seen
II IL be hoped that the OF these Rods may become
general as an important auxiliary defence against danger
which be regarded Of no ordinary magnitude 70
which all buildings liable. X. sItIMAN, Jr,
Prof Of Chem. In the University of Louisville.
LovIsyIILE, January q, 1851.
All orders LEFT ut ANDREW DUFPYS Stove Nanu factory,
eth street, will be promptly attended to; at GEORGE
BELLS Alexandria, Va, corner Of King and st. Asaph ss.
ap lift