Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-05-20
Protection from Lightning.

NHE undersigned, being the duly appointed agent %
MNGRoD MASuFAcToRr Covngton, Kentucky bsgs to offer
these superior Rods of Spiral Ahnealed
Iron with Zinc Protectors and Eectroposnye elements
combined in their thus rendering them
copper conductors They are IN 5enes lengths with
style metallic paened attachments, for brick or
frame buildings also glass ,Soa.ers OF novel and nge-
mounted with solid platinum silver point (patented)
inches long at the base with three
lar negative magnets which possess the power to extra
ordinary extent Of dschargng the opposite elements
most fearful thunderstorm and embrace the entire perc
ton of science up TO the present me the whole constu
ting the most and perfect silent conductor
presented to the public.
Safety has not been compromised by aordng these
cent rods at such low rates. the greatest attention has
been given to their to be readily attached
The astonishing Of the negative magnets in charg
ing the air of its opposite elements has been clearly demon
srated by the Eectrometer when unmagnetized 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
These being secured by double letters pa
tent you hereby cautioned against laying yourselves
liable by purchasing Of those who are not authorized or
appointed show their certificates Have good rods
none. CHARLES w. HEYDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to Sprats Patent Points for Lightning
Rods and that the results of these experiments convince
that they will resist the action of atmospheric and
thereby preserve the extremity sharpa condition most
enta to protection against lightning The reagents used
in the above experiments solution Of chloride of
dium common sat acetc acid suphuric acid and hydro
chorc acid With the first, there action the
metal with the several acids there very ga 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.. spratt offered 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 crti
caly, James Spratts Patent Lightning Rods, that
Of opinion that is constructed scientific principles For
combining durability cheapness, and efficacy, deem il
equal and think superior, to any other rod offered
| for my inspection. Prof JAS. " y. BLANEY.
| AUGUSTA, (GA) November IL, 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolatng Attachments,
featured by Mr. spra and regard them constructed il
conformity TO the general laws of the electric fluid and the
metallic compound constituting the Points, AS promising
from the result of several tests which they submit
ted to resist for the action of those
most likely to corrode them A. MEANS,
Prof Phys. Sc, 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
well devsed and in point of mechanical construction
are the best have
1t to be hoped that the of these Rods may become
which must be regarded of ordinary magnitude,
which all buildings are liable r. SILIMAN, Jr.,
Prof of Chem. in the University of Louisville
LOUISVILLE, January n, 1851.
All orders left at ANDREW DUFFYS Stove Nanufactory
7th street, will be promptly attended to- at GEORGE
BELLS Alexandria, Va, of King and ST. Asaph
ap lift