Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-22

VtHE uhd rsigned being the duly appointed Agent Of
sa-oD MANDATORY Covington Kentucky, begs to offer
these superior Rods, Of Spiral Carbonized Anneaied
Iron with Zinc Protectors and elements
combined in manufacturer thus rendering them equal
20 copper a. They are In teneet lengths wtn
new style q metallic aepted attachments, for brick
frame pudings also, glass solaers, OF novel and inge
mounted with solid platinum silver point, (patented)
twelve inches long, the with three angu
ordinary extent Of dschargng opposite clements Of the
most fearful thunderstorm embrace the entire perec
ton Of science up TO the present me whole constu
ting the most magnificent and perfect silent conductor ever
Safety has not been compromised by aordng these ex
ceent rods ut such low rates the greatest attention has
given their construction readily attached
The astonishing power of the negative in dishar
ing its opposite elements has been clearly demon
by the Elecrometer, when unmagnetized points
but slight results, though placed under the
conditions 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 pa
tent you hereby cautioned against laying yourselves
LIABLE by purchasing Of those who not authorized
who substituting inferior limitations All agents duly
none ts CHARLES W. HEYDoN,
f@#" sa Washington City.
do hereby certify that have app lied various powerful
chemical reagents spratts Patent Points for Lightning
Rods that the results these experiments convince
that they will resist the action of atmospheric causes
thereby preserve the extremity sharpa condition
sena TO protection against lightning The reagents used
dunn common SALT acetc acid suphuric acid, and hydro
chlorc acid With the first, there action the
METAL with the several acids there very sla fact
sufficient show that atmospheric influences would have
no sensible effect
JOHN LEcoNTE, Prof of Nat, Phil. etchem.
UNIVERSITY OF Ga, October 3, 1850.
The Lightning Conductors of Mr. spratt offered to me,
well calculated to perform the Office for which they
intended. Yours truly, Prof. ROBT. PETER.
LEXINGTON, KY, February 20, 1850
CHICAGO, September 3, 1850.
This may certify that have examined, somewhat criti
caly James Spratts Patent Lightning Rods and that
of opinion that 1t is constructed scientific principles For
combining durability, cheapness, and efficacy deem 1t
equal and think SUPERIOR to 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 Isolating Attachments
featured 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 tests to which they submit
ted 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 NJ Smith,
of this city, the plan of Mr. Spra appear to to be
very well DEVISED and in point Of mechanical construction,
are the best have
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 r. SILIMAN, Jr.
Prof of Chem. in the University of Louisville.
LOUISVILLE January ~, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
th street, will be promptly attended to- at GEORGE
BELLS Alexandria, Ya of King and St Asaph sts
an 14-tf