Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-04-22
Protection from Lightning.

NHE undersigned being the duly appointed Agent of
MING ROD MANDATORY Covington Kentucky, begs
these superior Rods of sprawed Carbonzed Annealed
Iron with Zinc Protectors and Retrospective elements
combined in their manufactured rendering them equal
copper conductors They teneet lengths with
accuraeytted connecting joints an entire
style of metallic paented) attachments for brick or
buildings also, glass solaers of novel and nge
NOUS construction (patentedO forming lock; the whole
inches long, surrounded at the base with three
lar negative which possess the power to an extra
most fearful Thunderstorm and embrace the entire perc
ton Of science to the present me the whole consttu
ting the most magnificent and perfect silent conductor
presented to the public
Safety not been compromised by aording these ex
ceen rods at such low rates. the greatest attention has
been given their be readily attached
The astonishing OF the negative magnets in dscharg
the air OF Its opposite elements has been clearly demon
strated by the Eiectrometer when unmagnezed points
have shown but slight results though placed under the
electricity from the atmosphere when you would scarcely
suspect any being present
These improvements being secured by double letters
tent you hereby cautioned against laying yourselves
LIABLE by purchasing Of those who not authorized
who substituting inferior limitations All agents duly
asHs'''' -" '''' '' CHARLES Y HEyDoS
do hereby certify that app lied various powerful
chemical reagents to Spras Patent Points for Lightning
Rods and that the results of these convince
that they will resist the action of atmospheric causes and
thereby preserve the extremity sharp-a condition most
sential to protection against lightning The reagents used
in the above experiments solution of chloride Of
dunn, Common sa acec acid suphuric acid, and hydro
chloric acid. With the first, there action tho
metal; with the several acids, there very sa 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 to me-
are well calculated to perform the Office for which they
LEXINGTON, KYr February 20, 1850.
CHICAGO, September 8, 1850.
This may certify that examined somewhat criti
pinuR o1a md m
of opinion that is constructed scientific principles For
combining durability, cheapness, and efficacy deem 1t
equal and think SUPERIOR to any other rod offered
for my inspection Prof. JAS. v. a. BLANEY.
AUGUSTA, (GA) November IL, 1850
This will certify that have examined the Lightning
Rods, Metallic Points, and lsoating Attachments
featured by Mr. Spra and regard them constructed in
conformity to the general laws of the electric ud andhe
metallic compound constituting the Points promising,
from the result of several tests which they submit
ted to resist for the action of those atmospheric
most likely to corrode them A. MEANS,
Prof Phys. Sc. Emory College, Ga, and Prot. Chem and
Pharm., Medical College, Ga.
The Lightning Conductors put up by Mr. Henry Smith,
of this city, the plan of Mr. Sprat appear TO be
well devised and in point of mechanical construction
are the best have
1t to be hoped that the of these Rods become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude, to
which all buildings liable. X. SILIMAN, Jr.,
Prof of Chem. in the University of Louisville
LOUISVILLE, January q, 1851.
All orders left at ANDREW DUFFY's Stove Mandatory.
7th street, will be promptly attended to- at GEORGE
BELLS Alexandria, Va corner Of King and ST. Asaph sts
ap LIFT