Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-10
Protection from lightning.

1NHE undersigned being the duly appointed Agent OF
NsGRoD MANDATORY Coyngton, Kentucky begs TO oer
these superior Rods OF twisted Carbonized Anneaed
Iron with Zinc Protectors and Electropositys elements
combined In their manufacturer thus rendering them equal
copper as conductors They in teneet lengths with
brassscrew connecting joints, entire
style OF metallic (patented attachments for brick or
frame buildings also, glass isoaters of novel and inge
NOUS construction, (patented forming ock the whole
twelve inches long, at the with three angu
lar negative magnets which possess the power extra
ordinary extent of dscharng the opposite elements OF the
most fearful Thunderstorm embrace the entire perfec
ton of science up to the present times the whole constu
ting the magnificent and perfect silent conductor
has not been compromised by acrdng these ex
eeent rods at such low rates the greatest attention has
been given their to be readily attached
The astonishing power of the negative magnets in dschar
ing the air Of its opposite elements has been demon
straed by the Eiectromeer, when unmagnetized points
have shown but slight results though placed under the
conditions In fact they gather and silently discharge
electricity from the atmosphere when you Wouu scarcely
These improvements being secured by double letters
tent you hereby cautioned against laying yourselves
liable by purchasing of those who are not authorized
who substituting inferior limitations. All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HEfDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents spratts Patent Lightning
Rods and that the results these experiments convince me
that they will resist the action Of atmospheric causes and
thereby preserve the extremity sharpa condition most
enta to protection against lightning The reagents used
dium common sa acetic acid sulphurc acid and hydro
choric acid. With the first there action the
metal with the several acids, there very sga fact
sufficient to show that atmospheric influences would have
sensible effect.
JOHN LECONTE, Prof of Nat Phil. ct Chem.
UNIVERSITY OF Ga, October 8, 1850
The Lightning Conductors of Mr.. Sprat offered to me-
well calculated to perform the office for which they
intended Yours, truly Prof ROBT. PETER.
LEXINGTON, KY. February 20, 1860.
CHICAGO, September 3, 1850.
This may certify that have examined somewhat erit
Dol iDhf
of opinion that it constructed scientific principles For
combining durability, cheapness and efficacy, deem It
equal and think SUPERIOR to any other rod ever oeed
for my inspection. Prof JAS " u. BLANEf.
AUGUSTA, (GA.) November IL, 1850.
This will certify that have examined the lightning
Rods Metallic Points and Isolang Attachments, manu-
featured by Mr. Spra and regard them constructed in
conformity the general laws of the electric fluid and the
metallic compound constituting the Points, promising,
result of tests to which they submit
ted to resist for years the action of those atmospheric
most likely to corrode them A. MEANS,
Prof Phys. &C.. Emory College, Ga, and Prof Chem and
Pharm, Medical College, Ga.
The Lightning Conductors put up by Mr. Henry Smith,
of this city, the plan of Mr. Sprat appear to to be
very well devised and in point of mechanical construction
the best have
1t is to be hoped that the of these Rods may become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude, to
which all buildings are liable. X. SILIMAN, Jr,
Prof of Chem. in the University of Louisville.
LOUISVILLE, January u, 1851
All orders left at ANDREW DUFFYS Stove Mandatory,
7th street. will be promptly attended to; Mt GEORGE
BELLS Alexandria, Va OF King and St. Asaph sts
lift