Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-19

rNHE undersigned, being the duly appointed Agent Of
ssRoD aAsus1cronT cogipsOn, Kentucky bsss to offer
these superior Rods Of twisted Carbonzed Annealed
combined in their manuacture thus rendering them equal
copper as conductors They in tenee lengths with
style Of metallic paented) attachments, for brick
frame buildings; also, glass isolaters, Of novel and nge
mounted with 1 sos platinum SILVER point atents S
twelve inches long, surrounded at the base with
ordinary extent of ischargng the opposite elements Of the
fearful Thunderstorm and embrace the entire perc
ton Of science up to the present time the whole consttu
ting the magnificent and perfect silent conductor
presented to the public
Safety has not been compromised by affording these
ceent such low rates. the greatest attention has
given their construction to be readily attached
The astonishing power of the negative magnets in dischar
the air Of its opposite elements has been clearly demon
strated by the Eectrometer when unmagnezed 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 py double letters pa
tent you hereby cautioned against laying yourselves
liable by purchasing of those who are not or
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HEYD0N,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to spratts Patent Points for Lightning
they will resist the action of atmospheric causes and
thereby preserve the extremity sharp-a condition most
senta 10 protection against lightning The reagents used
in the above experiments solution of chloride
dunn common sat acetc acid suphuric acid hydro
chlorc acid With the first, there no action the
metal with the several acids there very sa fact
sufficient to show that atmospheric influences would have
| no sensible effect.
UNIVERSITY OF Ga, October 8, 1850.
The Lightning Conductors of Mr. spratt, offered to me,
well calculated to perform the Office Ro which tsy
LEXINGTON ky, February 90 1850.
CHICAGO, September 3, 1850.
This may certify that have examined, somewhat criti-
calIy james Spratts Patent Lightning Rods and that am
of opinion that IL is constructed scientific principles For
combining durability cheapness, and efficacy deem 1t
equal and think SUPERIOR to any other rod over offered
| for my inspection. Prot. JAS. v. a. BLANEY.
AUGUSTA, (GA.) November il, 1850
This will certify that / have examined the Lightning
Rods Metallic Points and Isolating Attachments manu-
featured by Mr. Spra and regard them as constructed IN
conformity the general laws of the electric fluid and the
metallic compound constituting the Points, as promising,
the result Of several tests to which they submit
ted resist years the action of those atmospheric
most likely to corrode them. A. MEANS,
Prof Phys &c., Emory College, Ga, and Prof Chem. and
Pharnl. Medical College, Ga.
The Lightning Conductors put up by Mr.. Henry NJ. Smith,
of this city, the plan Of Mr. Sprat appear to me to be
very well devised and in point Of mechanical construction
are the best have
1t Is to be hoped that the Of these Rods may become
general important auxiliary defence against danger
which be regarded Of ordinary magnitude to
which all buildings are liable. r. SILIMAN, Jr.,
| Prof of Chem in the University of Louisville
| LOUISVILLE January 27, 1851.
All orders left at ANDREW DUFFY'S Stove Mandatory
It'll street. will be promptly attended to- at GEORGE
BELLS, Alexandria, Va Of King and ST. Asaph SITS
| an 14-f