Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-05-22
Protection from Lightning.

VNHE undersigned being the duly appointed Agen. %
MASurAcroRI Covngton, Kentucky 6sgs . ons
these superior Rods of Spraltwisted Carpo1h isnts
IRON with Zinc Protectors and bss them equal
TO copper conductors They are IN ,ts sntira
nav tv ~ metallic Tpatented attachments for brick or
frame buildings also glass isolaters OF mover anu my
n,oSs itS sOS platinum point lpatened
twelve inches long, surrounded at the base with three
Of dshargng the opposite elements OF the
most fearful Thunderstorm, ana embrace the entire perfec
on Of science up the present tme the whole constu
ting The most magnificent and perfect silent conductor
presented TO the public
ceent at such low rates. the greatest attention has
been given their construction be readily attached
The astonishing power of the negative magnets discharg
ing the air Of its opposite elements has been clearly
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.
tent you hereby cautioned against laying yourselves
liable by purchasing Of those who are not or
who substituting inferior limitations All agents duly
appointed show their certificates Have good rods or
none CHARLES W. HEYDoN,
Washington City.
hereby certify that have app lied various powerful
chemical reagents TO Sprats Patent Points for Lightning
Rods and that the results of these experiments convince me
that they will resist the action of atmospheric causes, and
thereby preserve the extremity sharpa condition most e
ental protection against lightning The reagents used
in the above experiments solution Of chloride of
dunn common acetic acid sulphurc acid and hydro
choric acid. With the first there action on the
metal; with the several acids, there very SJha fact
sufficient to show that atmospheric influences would have
no sensible effect.
JOHN LECoNTE. Prof. Of Nat Phil. ct Chem.
UNIVERSITY OF Ga. October s. 1860.
The lightning Conductors OF Mr. Spratt, offered to me,
are well calculated to perform the Office for which they are
intended. Yours, truly, Prof ROBT PETER
LEXINGTON, KY, February 20 1850.
CHICAGO, September 5, 1850.
This may certify that have examined, somewhat crit
| call am
Of opinion that is constructed scientific principles For
combining durability, cheapness, and efficacy deem II
equal and think SUPERIOR to any other rod offered
for my inspection Prof JAS. v. q BLANEY.
AUGUSTA (GA.) November H. 1850.
This will certify that have examined the Lightning
Rods Metallic Points and Isolnting Attachments, manu-
featured by Mr. Sprat and regard them constructed II
conformity the general laws of the electric fluid and TIT
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 Prof Chem.
Pharm, Medical College, Ga.
The Lightning Conductors put up by Mr. Henry VI Smith
Of this city, the plan of Mr. Sprat appear to to
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 tc
which all buildings are liable. r. SILIMAN, Jr,
Prof Of Chem in the University Of Louisville.
LOUISVILLE January q, 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
ap lift