Daily American telegraph., 1852-08-06
Protection from Lightning.

JNHE undersigned being the duly appointed Agent OF
SPRArfs ELECTRICIAN AND ELECTRO METAILuRolsr Leaf-
HssRoD MAHUPAcroRY Coyngton, Kentucky begs to oer
these superior Rods OF Spraltwsted Carbonled Anneaeu
Iron, with Zinc Protectors, and EectroposuVe ssnen
combined in their manufacturer thus rendering them equ
to copper conductors. They in tenieet engths Win
brasscrew connecting joints an enure
frame buildings; also glass soaters Of novel and nge
NOUS construction, atented 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 possess the power 10 an extra
ordinary extent dschargng the opposite elements OF the
most fearful Thunderstorm embrace the entire perec
ton of science up to the present time the whole consuu'
ting magnificent and perfect silent conductor ever
SAFETY has not been compromised by aording these
eeent rods at such low rates. the greatest attention has
given their construction as to be readily attached
The astonishing power Of the negative magnets In dscharg
ing the air of its opposite elements has been clearly demon
straed by tho Eectrometer when unmagnetaed points
have shown but slight results, though placed under the
conditions In fact they gather and silently Discharge
electricity nom the atmosphere when you would scarcely
These being secured by double letters pa
tent are hereby cautioned against laying yourselves
liable by purchasing of those who not authorized or
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HEYD0N,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to Spras Patent Points for Lightning
Rods and that the results of these experiments convince
that they will resist the action of atmospheric and
thereby preserve the extremity sarpa condition most
sena to protection against lightning The reagents used
above experiments
dium Common sa acec acid suphuric acid, and hydro
choric acid. With the first, there was no action on the
metal; with the several Acids there very slga fact
sufficient to show that atmospheric influences would have
~ JOHN LEcoNTE Prof Of Nat Phil. ct Chem.
UNIVERSITY OF GA, October g. 1850.
The Lightning Conductors Of Mr. Spratt offered TO me,
are calculated perform the office for which they are
intended Yours, truly, Prof ROBT. PETER.
LEXINGTON, Ky. February 20, 1850
CHICAGO September 3, 1850.
This may certify that have examined somewhat criti-
cay Spratts Patent Lightning Rods and that am
of opinion that constructed scientific principles For
combining durability, cheapness, and efficacy deem it
equal and think SUPERIOR any other rod offered
for my inspection Prof. JAS. v. 2. BLANEY.
AUGUSTA, (GA) November IL, 1850
This will certify that have examined the Lightning
Rods Metallic Points and Isoating Attachments manu-
by Mr. Spra and regard them constructed In
conformity general laws of the electric fluid and the
metallic compound constituting the Points, promising,
from several tests to which they submit
ted 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 NJ Smith,
of this city, the plan Of Mr. Spra appear to me to be
very well devised and in point Of mechanical construction
are the best have
It to be hoped that the of these Rods become
general important auxiliary defence against danger
which must be regarded Of no ordinary magnitude, to
which all buildings are liable. II. SILIMAN, Jr.
Prof Of Chem. in the University of Louisville
LOUISVILLE, January u, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
It'll street. will be promptly attended to- or at GEORGE
BELLS Alexandria, Va corner of King and st. Asaph sts
un1