Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-04-16
Protection from Lightning.

TNHE undersigned, being the duly appointed Agent Of
NaoD MANDATORY, Covington, Kentucky begs to offer
these superior Rods Of spiratwsted Carbonized Annealed
combined their manufacturer thus rendering them equal
copper conductors They in teneet lengths, with
accurately fitted connecting joints entire
style Of metallic patented attachments, for brick
frame buildngs ALSO glass isoater OF novel and nge
mounted with solid platinum silver point (patented)
twelve inches long, surrounded at the base with three angu
ordinary extent Of schargng the opposite elements Of the
most fearful Thunderstorm, and embrace the entire perfeo
ton Of science up TO the present time the whole consu
presented to the public.
eent at such low rates. the greatest attention has
been given to their construction to be readily attached
The astonishing Of the negative magnets in discharg
the air of Its opposite elements has been clearly demon
by the Eectrometer, when unmagnetzed 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 you hereby cautioned against laying yourselves
LIABLE by purchasing Of those who are not or
appointed show their certificates Have good rods or
none CHARLES W. HEYDON,
Washington City.
hereby certify that have applied various powerful
Rods and that the results of these experiments convince
that they will resist the action of atmospheric and
senta to protection against lightning The reagents
in the above experiments solution Of chloride OF 60
dum common SALT acetc acid suphuric acd and hydro
chlorc acid With the first, there action on 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 s, 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, 1880
CHICAGO September 8, 1850.
This may certify that have examined somewhat crit
cay James Spratts Patent Lightning Rods and that
opinion that 1t 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. v 2. BLANEY.
AUGUSTA, (GA) November ii, 1850.
This will certify that have examined the Lightning
Rods Metallic Points and Isolatng Attachments,
featured by Mr. Spra and regard them constructed in
conformity to the general laws Of the electric uid and the
metallic compound constituting the Points, promising
the result Of several tests to which they submit
ted resist for years the action of those atmospheric causes
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. Spra appear to to be
very well devised in point of mechanical construction,
the best have seen.
1t hoped that the of these Rods may become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude, to
which all buildings are liable. r. SILIMAN, Jr,
Prof Of Chem. in tho University Of Louisville.
LOUISVILLE, January e. 1851.
All orders left at ANDREW DUFFYs Stove Mandatory,
It'll street, will be promptly attended to; at GEORGE
BELLS Alexandria, Va, Of King and St. Asaph ss
ap 14-U