Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-04

FINHE undersigned being the duly appointed Agent OF
NNdop MANUFAcroRY Coyington Kentucky begs TO oler
these superior Rods, Of Spiraltwsted CaroonIed
Iron with Zinc Protectors, and Eectroposuye elements
combined in their manufacturer thus rendering them
TO copper conductors They in teneet lengths win
accuraelytt brass screw connecting joints, entire
style of metallic atented) attachments, for brick or
frame buidings also glass solaters OF mover ana g
mounted with solid platinum silver point, (patentsd)
twelve inches long, surrounded at the base with three angu
lar negative which possess the power 70 an Ok M
most fearful Thunderstorm and embrace the entire perec
ton Of science up to the present me the whole eonsttu
ting the magnificent and perfect silent conductor
presented TO the public.
Safety has been compromised by afording these
ceent rods at such low rates the greatest attention has
been given other construction as to be readily attached
The astonishing of the negative In dscharg
ing the air opposite elements has been clearly demon
straed by the Eectromeer, when unmagnetzed points
have shown but slight results though placed under the
same conditions In fact they gather and silently discharge
electricity from the atmosphere when you wouu scacey
suspect any being present. ,...
These improvements being secured by double letters pa
tent you hereby cautioned against laying yourselves
LIABLE by purchasing of those who are not Of
who substituting inferior limitations. All agents duly
appointed can show their certificates Have good rods OF
none. CHARLES w. HEYDON,
Washington City
do hereby certify that have app lied various powerful
chemical reagents TO spratt Patent Points for Lightning
Rods and that the results of these experiments convince
that they will resist the action of atmospheric causes and
thereby preserve the extremity sharp condition most
sential 10 protection against ghtnng The used
the above experiments solution of chloride Of
diun sa acec acid sulphuric acid, and hydro
choric acid. With the first, there action the
meal with the several acids, there very Stgha fact
sufficient show that atmospheric influences would have
no sensible effect
JOHN LEcONTE. Prof of Nat. Phil. ct Chem.
UNIVERSITY or GA, October 8 1850,
The Lightning Conductors Of Mr. Spratt offered to me,
we'll calculated to perform the Office for which they are
intended. Yours, truly, Prof R0BT. PETER,
LEXINGTON, KY, February 20, 1850
CHICAGO September 8, 1850.
This NAV certify that have examined somewhat criti-
PAT
of opinion that is constructed scientific principles For
combining durability, cheapness, and efficacy deem 1t
equal and think SUPERIOR to other rod ever offered
for my inspection Prof. JAS. v. 2. BLANEY.
AUGUSTA, (GA) November IL, 1850
This will certify that have examined the Lightning
Rods Metallic Points aud Isolating Attachments, manu-
featured by Mr. Sprat and regard them constructed In
conformity the general laws of the electric ud and the
metallic compound constituting the Points, promising,
the result of several tests to which they submit
to resist for years the action of those
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,
this city, the plan of Mr. Sprat appear to 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 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 the University of Louisville
LOUISVILLE, January rs 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
eth street, will be promptly attended to- at GEORGE
BELLS Alexandria, Va of King and St. Asaph sts
lift