Daily American telegraph., 1852-05-12
Protection from Lightning.

rNHE undersigned, being the duly appointed Agent of
sGRoD MANuFAcToRr Covngton, Kentucky, begs to offer
these superior Rods OF Spatwistd Carbonzed Annealed
Iron with Zinc Protectors, and Electroposye elements
combined in their manuacure thus rendering them equal
copper conductors They In eneet lengths with
accurately fitted brassscrew connecting joints entire
style Of metallic (patented attachments for brick
frame buidngs ALSO glass isoaters of novel and nge
NOUS construction, Qatented) forming lock- the whole
mounted with solid platinum silver point (patented0
twelve inches long, surrounded at the base with three
lar negative magnets which possess the power to extra
ordinary extent Of dchargng the opposite elements Of the
most fearful Thunderstorm and embrace the entire perec
ton Of science up to the present time; the whole consu
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not been compromised by aording these
ceent rods at such low rates the greatest attention has
been given to their construction to readily attached
The astonishing of the negative magnets dschar
ing the air Of its opposite elements has been clearly demon
sraed by the Electrometer, when unmagnezed points
shown but slight results though placed under the
conditions In fact they gather and silently discharge
electricity sm the atmosphere when you would scarcely
These improvements being secured by double letters pa,
tent you hereby cautioned against laying
table, by purchasing of those who not authorized
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
none CHARLES W. HEYDoN,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to Spratts Patent Points for Lightning
Rods and that the results of these experiments convince
thereby preserve the extremity shara condition most
senal to protection against lightning The used
in the above experiments solution OF chloride of
dium common sat acetic acid sulphurc acid and hydro
choric acid With the frst there action on the
metal; with the several acids there very sg-a fact
sufficient to show that atmospheric influences would have
sensible effect
JOHN LECONTE, Prof of Nat Phil. ct Chem
UNIVERSITY OF Ga, October 8, 1850
The Lightning Conductors of Mr.. sprat offered to me-
well calculated to perform the Office for which they
intended. Yours, truly, Prot. R0BT. PETER.
LEXINGTON, KY. February 20 1850.
.... CHICAGO, September 3, 1850.
This may certify that have examined, somewhat crt
cally James Sprats Patent Lightning Rods and that
of opinion that Is constructed scientific principles For
combining durability, cheapness, and efficacy, deem it
equal and think superior to any other rod offered
for my inspection. Prof JAS. v. q BLANEY.
AUGUSTA, (GA) November II, 1850
This will certify that have examined the Lightning
Rods Metallic Points, and Isoating Attachments manu-
actured by MIR. Spra and regard them constructed in
conformity the general laws the electric ud and
metallic compound constituting the Points, promising
from the result of several tests which they submit
ted to 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. Spratt appear to to be
very well devised and in point of mechanical construction
the best have ever seen .
1t is to be hoped that the Of these Rods become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude, tc
which oil buildings liable. r. SILIMAN, Jr,
Prof of Chem. in the University of Louisville.
LOUISVILLE, January y, 1851. a'...
All orders left at ANDREW DUFFY'S Stove Mandatory
7th street, will be promptly attended to; at GEORGE
BELLS Alexandria, Va corner of King and St Asaph SITS
ap 14-tf