Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-30

FUNHE undersigned being the appointed Agent OF
sPRATr's ELECTRICIAN AND ELECTRO MErAILURasr LIGHT
ROB MASUFAcroRY Covngton, Kentucky begs to offer
these superior Rods OF Carbonised Annsed
combined in their manufactures thus rendering them equal
to copper as conductors They are in lengths with
accurately connecting joints, entire
style of metallic (patente attachments for brick or
frame buildings also, glass isoate OF novel and nge-
mounted with solid platinum silver point lpatented)
twelve inches long, at the base with three
lar negative magnets which possess the power to an extra
ordinary extent Of schargng the opposite clements OF the
most fearful Thunderstorm and embrace the entire perc
ton of science to the present tme the whole constitu-
ting the most magnificent and perfect silent conductor ever
presented to the public.
Safety has not been compromised by aording these
ceent rods at such low rates. the greatest attention has
been given their construction to be readily attached
The astonishing power negative magnets in dscharg
ing the air It's opposite clements has clearly demon
strated by the Eectrometer when unmagnetzed points
shown but slight results though placed under the
same conditions In fact they gather silently discharge
electricity from the atmosphere when you would scarcely
These being secured by double letters pa
tent hereby cautioned against laying yourselves
liable by purchasing of those who not authorized,
who substituting inferior limitations. All agents duly
appointed show their certificates Have good rods or
none. CHARLES w. HEfDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to sprats Patent Points for Lightning
Rods that results of these experiments convince
that they will resist the action OF atmospheric causes and
thereby preserve the extremity sharpa condition most
sential 10 protection against lightning The reagents used
in the above experiments solution Of chloride of so
choric acid. With the FIRST there action on the
METAL with the several acids, there very Sga fact
sufficient to show that atmospheric influences would have
sensible OBJECT.
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 are
LEXINGTON, KY, February 20, 1850.
CnIoAGo, September 3, 1880.
This may certify that have examined, somewhat crit
cally James Spratts Patent Lightning Rods and that
opinion that Is constructed scientific principles For
combining durability, cheapness, odd efficacy deem IL
equal and think SUPERIOR TO any other rod offered
for my inspection. Prof JAS. " H. BLANEf.
AUGUSTA, (GA.) November IL, 1850.
This win certify that l have examined the Lightning
Rods Metallic Points and Isoating Attachments,
conformity to general laws of the electric fluid 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
most likely 10 corrode them. A. MEANS,
Prof Phys &c. Emory College, Ca aud 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 10 me 70 be
well devised and I'm point Of mechanical construction,
are the best have
Is he hoped that the Of these Rods may become
general important auxiliary defence against danger
which regarded Of ordinary magnitude, TO
which all buildings are liable. X. sILIMAN, Jr,
Prof of Chem. In the University Of Louisville.
LOUISVILLE, January n, 1851.
All orders LEFT at ANDREW DUFFYs Stove Mandatory,
7th street. will he promptly attended TOT at GR0RGE
BELLS, Alexandria, Va of King and St. Asaph St.
AM 4-H