Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-17
Protection from Lightning.

NHE undersigned being the duly appointed Agent OF
SpRATrs EIEoTRIcAN AND EEcTRo MErAILURaIsT Light
SSeoD MASUBAcToRT Coyngton, Kentucky begs 70 oner
these superior Rods Of carbon1ed Annealed
IRON with Zine Protectors and Elecroposiuye elements
Combined IN their manufacture thus rendering them equal
70 copper as condrctor They in eneet lengths with
new style OF metallic (patented) attachments for brick
frame puldings also, glass isoaters of novel and nge
mounted with solid platinum silver point. (patented
inches long, surrounded at the with three angu
lar negative magnets which power to an extra
ordinary extent Of dschargng the opposite elements Of the
most fearful Thunderstorm and embrace the entire perec-
ton Of science up to the present time the whole cons
ting the most magnificent and perfect silent conductor ever
presented To the public. $50 rs 3fF9
Safety has not been compromised by afordin9 tbasa az
celent rods at such low rates. the greatest attention has
been given their construction as TO be readily
The astonishing power Of the negative magnets in discar
ing the air Of s opposite elements been clearly demon
strated 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
suspect any being present.
tent hereby cautioned against laying yourselves
liable by purchasing Of those who are not authorized or
who are substituting inferior limitations. All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HEYD0N,
81. X. .r Washington City.
do hereby certify that have app lied various powerful
chemical reagents TO spras 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
enti 10 protection against lightning The used
in the above experiments solution of chloride Of
dunn common SALT acec acid sulphurc acid and hydro
choric acid. With the first, there action the
metal; with the several acids there very sLgh- fact
sufficient to show that atmospheric influences would have
no sensible effect. s'.
JOHN LECONTE Prof of Nat. Phil. ct Chem.
UNIVERSITY OF Ga. October g. 1850. +.
The Lightning Conductors of Mr. spratt offered to me-
well calculated to perform the Office for which they
intended. Yours, truly Prof R0BT. PETER.
LEXINGTON, KY. February 20, 1850
CHICAGO September 8, 1850.
This may certify that have examined somewhat crit
cay, James Sprats Patent Lightning Rods, and that am
of opinion that 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. " q. BLANEf.
AUGUSTA, (GA) November H. 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 fluid 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 to corrode thems A. MEANS,
Prof. Phys. &c., Emory College, Ca 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 be
very well devised and in point of mechanical construction
are the best have seen.
1t is to be hoped that the use of these may become
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 n, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
eth street. will be promptly attended to; or at GEORGE
BELLS Alexandria, Va of King and St. Asaph ss
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