Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-09-08
Protection from Lightning.


TNHE undersigned, being the duly appointed Agent OF
i SPRATTs ELEcTMcAN AND ELECTRO METALLURaIsr LIGHT
NNGRoD MANUFAcToRI Covngton, Kentucky begs to offer
these superior Rods Spratwisted Carbonized Annealed
Iron with Zinc Protectors, and Eectroposive eements
combined in their manufacturer thus rendering them equa
TO copper conductors They are in teneet lengths with
accurateyfed brassscrew connecting joints, an entire
new style Of metallic Gr . Ddlin s OF
NOUS construction, paented forming lock; the whoe
mounted with solid platinum silver point patenteaJ
lar negative magnets which the power to an extra
ordinary extent dschargng the opposite elements Of the
most fearful thunderstorm, and embrace the entire perec
ton of science up to the present me the whole constu-
ting the most magnificent and perfect silent conductor ever
presented to the public.
Safety has not been compromised by aording these
cent rods at such low rates. the greatest attention has
been given to their construction be readily attached
The astonishing power the negative magnets in dscharg
ing the air of Its opposite elements has been clearly demon
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
These being secured by double letters pa
tent you hereby cautioned against laying yourselves
liable by purchasing Of those who not authorized
who substituting inferior limitations. All agents duly
appointed show their certificates Have good rods or
none. CHARLES w. HEfDONt
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to spratrs Patent Points for Lightning
Rods and that the results these experiments convince
that they will resist the action Of atmospheric causes and
sena to protection against lightning The reagents used
in the above experiments solution Of chloride OF go
dum common SALT acetic acid suphuric acid and hydro
chlorc acid With the first, there no action on the
meta with the several acids there very sga fact
sufficient to show that atmospheric influences would have
sensible effect.
JOHN LEooNTE, Prof of Nat. Phil. etChem.
UNIVERSITY OF GA, October 5, 1850.
The Lightning Conductors Of Mr. spratt offered to me,
well calculated to perform the office for which they are
intended. Yours truly, Prof RoBT. PETER.
LEXINGTON, KY, February 20, 1850.
CHICAGO, September 8, 1850.
This may certify that have examined, somewhat crit
cay, James Spratts Patent Lightning Rods and that am
Of opinion that u h constructed on scientc principles For
combining durability, cheapness, and efficacy deem It
equal and think SUPERIOR TO any other rod offered
for my inspection. Prof JAS. V. y. BLANEY.
AUGUSTA, (GA) November IL, 1850.
This will certify that have examined the Lightning
Rods, Metallic Points and Isolating Attachments, manu-
featured by Mr. Spra and regard them constructed In
conformity to the general laws of the electric fuid and this
metallic compound constituting the Points promising,
from the several tests TO which they submit
ted to resist for the action Of those atmospheric causes
most likely TO corrode them A. MEANS,
Prof Phys. &c. Emory College, Ga and Prof Chem. and
Pharmr 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 ever seen.
1t il 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. r. SILIMAN, Jr,
Prof Of Chem. in the University of Louisville.
LOUISVILLE, January II, 1851.
All orders left at ANDREW DUFFYs Stove Mandatory,
18th street, will be promptly attended to; or at GEORGE
BELLS Alexandria, Va corner of King and st. Asaph sts
sp1 +n