Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-18
Protection from Lightning.

1,HE undersigned, being the duly appointed Agent Of
EseRoD MAsuFAcToRI Coyingon Kentucky begs to offer
these superior Rods OF CarbonIed Anneaied
co%Sned a9s ssa thus them equal
copper as conductors They in tenee lengths with
@ brasssorew connecting JOINTS an snufe
ne" sle OF metallic (patented attachments, Tor prick OF
TAME puidings also glass isolaters of novel and nge
NOUS construction paented forming lock; the whole
mounted with solid platinum silver point (patentedD
twelve inches long the with three angu
lar which possess the power to an extra
most fearful thunderstorm embrace the entire pereo
ton Of science up to the present me the whole consu-
presented to the public IS
Safety has not been compromised by aording these ex
ceen rods at such low rates. the greatest attention has
given their construction readily attached
The astonishing Of the negative magnets dischar
ing of its opposite elements has been clearly demon
strated by the Electromeer when unmagnetzed points
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.
Theseimproyemens being secured by double letters pa
tent you hereby cautioned against laying yourselves
LIABLE by purchasing of those who are not authorized or
who substituting inferior limitations All agents duly
none CHARLES W. HEYDoN,
Washington City
do hereby certify that have app lied various powerful
chemical reagents to sprats Points for Lightning
Rods that the results of these experiments
that they will resist the action Of atmospheric causes and
thereby the extremity sharpa condition most
senta TO protection against lightning The reagents used
in the above experiments solution Of chloride of
du Common salt acetc acid sulphurc acid and hydro
chlorc acid With the FIRST there no action on the
METAL with the several acids, there very sa fact
sufficient to show that atmospheric influences would have
no sensible effect.
JOHN LEcoNTE. Prof of Nat. Phil. ct Chem
UNIVERSITY OF GA, October 8, 1850
The Lightning Conductors of Mr.. spratt offered to me-
well calculated perform the office for which they
intended. Yours truly, Prof RoBT. PETER.
LEXINGTON KY, February 20, 1850.
CHICAGO, September 3, 1850.
This NAV certify that have examined, somewhat criti
40 tuhf
Of opinion that it is constructed scientific principles For
combining durability cheapness, and efficacy, deem 1t
equal and think SUPERIOR to any other rod ever offered
for my inspection Prof JAS v. 2. BLANEY.
AUGUSTA, (GA.) November IL, 1850.
This will certify that I have examined the Lightning
Rods Metallic Points, and Isolating Attachments, manu-
featured by Mr. Spra and regard them az constructed in
conformity to general laws Of the electric fluid and the
metallic compound constituting the Points, promising,
from the result of several to which they submit
ted resist years the action of those
most likely to corrode them. A. MEANS,
Prof Phys &c. Emory College, Ca, and Prof Chem and
Pharm. Medical College, Ga.
The Lightning Conductors put up by Mr. Henry M Smith
of this city, the plan of Mr. Sprat appear to me to be
very well devsed and point of mechanical construction
are the best have
It is to be hoped that the Of these Rods may become
general as an important auxiliary defence against danger
which be regarded Of ordinary magnitude, to
which all buildings are liable. II. SILIMAN, Jr,
Prof of Chem in the University Of Louisville.
LOUISVILLE, January q, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
7h street. will be promptly attended to; at GEORGE
BELLS Alexandria, Va corner OF King and St. Asaph sts
ap 14-tf