Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-05-01
Protection from Lightning.

YNHE undersigned, being the duly appointed Agent of
NGRoD MANDATORY, Covington Kentucky begs to offer
these superior Rods Of Sprawsted Carbonized Anneaed
Iron with Zinc Protectors, aud Eectroposive elements
combined in their manufactures thus rendering them equal
copper conductors They are in teneet lengths with
new svle Of metallic patentedo attachmen for brick or
frame buildings also glass isoater of novel and inge
NOUS construction Pa1cnted forming lock; the whole
mounted with solid platinum silver point, (patented
twelve inches long, surrounded at the base with three angu
lar negative magnets which the power extra
ordinary extent OF dischargn the opposite elements of the
most fearful thunderstorm and embrace the entire perec
ton of science up to the present me the whole consu
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not been compromised by aording these ex
ceen rods at such low rates. the greatest attention
been given to their to be readily attached
The astonishing of the negative magnets in dcharg
ing the mir Of its opposite elements has been clearly demon
straed 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.
These improvements being secured by double letters pa
tent are hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized
who substituting inferior limitations All agents duly
none sf ~ ~ ~ CHARLES y. nEYDoS, "
Washington City.
do hereby certify that have app lied various powerful
chemical reagents Spratts Patent Points Lightning
Rods and that results of these experiments me
that they will resist the action of atmospheric causes
thereby preserve the extremity sharpa condition
senta TO protection against lightning The reagents used
in the above experiments solution of chloride of
di Common sat) acetc acd suphuric acid, and hydro
chloric acid With the first, there action the
metal with the several acids there sga fact
sufficient 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. i
LEXINGTON, Ky, February 20, 1850.
CHICAGO, September 3, 1850.
This may certify that have examined somewhat criti
cally James Spras Patent Lightning Rods and that
of opinion that II 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. u. BLANEY
AUGUSTA, (GA) November IL, 1880
This will certify that have examined the Lightning
Rods Metallic Points and Isolating Attachments
actured by Mr.. Spra and regard them constructed in
conformity to the general laws of the electric hud and the
metallic compound constituting the Points promising,
from the result of several tests TO which they submit
ted to for years 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 by Mr.. Henry NJ Smith,
Of this city, the plan Of Mr. Spra appear TO to be
very well devised and in point of mechanical construction
tho best have seem
II Is to be hoped that the Of these Rods may become
general as important auxiliary defence against danger
which must be regarded Of no ordinary magnitude, TO
which MI buildings are liable. II. SILIMAN, Jr,
Prof Of Chem. in the University Of Louisville.
LOUISVILLE, January -, 1851.
All orders LEFT at ANDREW DUFFY'S Stove Mandatory
7th street. will be promptly attended 10; at GEORGE
BELLS Alexapdris Va, Of King and St Aaph
spl4-n