Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-04-28
Protection from Lightning.

,HE undersigned, being the duly appointed Agent Of
MANDATORY Coyingon, Kentucky begs to offer
these superior Rods of Carbonzed Annsaed
Irvn with Zine Protectors, and Eectroposive elements
combined in their manufacturer thus rendering them
copper conductors They tenfeet lengths with
accuraeytted brass screw connecting joints. entire
style OF metallic (patented attachments for brick or
frame buildings also glass isoaters novel aud nge
nious construction, aented forming lock; the whole
mounted with solid platinum silver point (patented,)
twelve inches long, surrounded at the base with thu ang
lar negative magnets which possess the power TO an extra
oy extent Of dlschargng the opposite elements of the
most fearful Thunderstorm and embrace the entire perc
ton OF science up to the present time the whole cons
ting the most magnificent and perfect silent conductor ever
presented TO the public
Safety has not been compromised by aording these
eeen rods at such low rates. the greatest has
been given their construction be readily attached
The astonishing power of the negative magnets In dicharg
ing the air OF its opposite elements has been clearly demon
have shown but slight results, though placed under the
same conditions In fact they and silently discharge
electricity from the atmosphere when you would scarcely
These improvements being by double letters pa
tent you hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized
who are substituting inferior limitations All agents duly
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 these experiments convince me
that they Will resist the action of atmospheric causes and
thereby preserve the extremity aharpa condition
senta to protection against lightning The reagents used
In the above experiments solution of chloride of
dunn Common salt acec acid suphuric acid and hydro
choric acid With the first, there action the
metal; with the several acids there very sgh-a
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 to 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 cr-
cally James Sprats Patent Lightning Rods and that
combining durability, cheapness, and efficacy, deem II
equal and think superior, to any other rod offered
for my inspection. Prof. JAS. V. T. BLANEY.
AUGUSTA, (GA) November IL, 1860.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolating Attachments
featured by Mr. Spra and regard them constructed In
conformity to the general laws of the electric fluid and
metallic compound constituting the Points, promising
from the result of several tests to which they submit
ted to resist for the action of those atmospheric
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 Mr. Henry NJ Smith,
of this city, the plan of Mr. Sprat appear to
well devised and in point Of mechanical construction
are the best have ever seen.
1t is to be hoped that the these may become
general important auxiliary defence against danger
which must be regarded as of no ordinary magnitude to
which all buildings are liable. r. SILIMAN, Jr.
Prof of Chem in the University of Louisville.
LOUISVILLE, January II, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
It'll street, will be promptly attended to; ut GEORGE
BELLS Alexandria, Va Of King and St. Aseph sts
up lift