Daily American telegraph., 1852-10-13
Protection from Lightning.

r,HE undersigned, being the duly appointed Agent Ct
NoRoD MANurAcroRr Covington Kentucky, begs to offer
these superior Rods of CarbonEed Anneaed
oom5ned their thus them eaua
to copper conductors They are In eneet lengths with
N an hr entire
frame budings ALSO glass isolaters of novel and iDge
NOUS construction pstentedD forming lock- the whole
mounted with solid platinum silver point, (patentedD
twelve inches long, surrounded at tho base with three angu
lar negative magnets which the power to extra
most fearful thunderstorm and embrace the entire perec
ton Of science up to the present time the whole constu
ting the most magnificent and perfect silent conductor
presented to the public
Safety has not been compromised by aordng these
ceen rods at such low rates the greatest attention has
been given their be readily attached
The astonishing power of the negative In dscharg
srated by the Eectrometer when unmagnetiaed points
have shown but slight results though placed under the
conditions In 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
tent you are hereby cautioned against laying yourselves
LIABLE by purchasing Of those who not authorized
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 Patent Points for Lightning
that they will resist the action Of atmospheric causes
thereby preserve the extremity sharpa condition most
sena TO protection against lightning The reagents used
In the above experiments solution Of chloride Of
dunn common sst acee acid sulphurc acid and hydro
chlorc acid With the FIRST there action on the
metal with the several acids there very s-a fact
sufficient TO show that atmospheric influences would have
sensible effect
JOHN LEcoNTE Prof of Nat Phil etChsm
UMvERsrrr or Ga, October s. 1850.
The Lightning Conductors Of Nlr spratt offered TO me-
are well calculated TO perform the Office for o yach they are
LEXINGTON, XII, February 20, 1850.
CHICAGO, September 8, 1851
This may certify that have examined somewhat cri
cay James Sprats Patent Lightning Rods, and that
of opinion that IL is constructed scientific principles For
combining durability, cbespness and efficacy, deem Il
equal and think SUPERIOR TO any other rod offered
for my inspection. Prof JAS v. z. BLANEY.
AUGUSTA, (GA.) November II, 1850.
This will certify that have examined the Lightning
Rods, Metallic Points, and Isolatng Attachments manu-
featured by Mr. Spra and regard them constructed in
conformity to the general laws of the electric fud and the
metallic compound constituting the Points promising
from the result Of several tests TO which they submit
ted to resist for years the action Of those atmospheric
most likely 10 corrode them. A. MEANB,
Prof Phys &C.. Emory College, Ga, and Prof Chem ana
Pharn, Medical College, Ga.
The Lightning Conductors put up by Mr. Henry NJ Smith,
Of this city, the plan Of Mr. Spratt appear to 10 be
very well devised and In point Of mechanical construction
the best have
TO be hoped that Of these Rods may become
general, important auxiliary defence against danger
which must be regarded Of 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 DUPPY'S Stove Manufhctory
eth street. will be promptly attended to; at GROkGE
BELLS Alexandria, vs corner Of King and st. Asaph
ap lift sFt