Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-11-03
Protection from Lightning.

rTIIE undersigned being the duly appointed Agent Of
MING ROD MAsurAoToRr, Covingon, Kentucky begs offer
these superior Rods Of Spratwsted Carbonized Annealed
Iron with Zinc Protectors and elements
to copper conductors They in lengths, with
accuratey6ed brassscre connecting joints, an entire
style of metallic (patente attachments for brick
frame buildings also glass isoaters OF novel and nge-
NOUS construction, atented forming lock; the whole
mounted with solid platinum silver point (patented)
twelve inches long, surrounded at the three angu
lar negative magnets which the power to an extra
most fearful Thunderstorm embrace the entire perec
ton Of science up to the present time the whole consu
ting the os magnificent and perfect silent conductor ever
presented to the public.
Safety compromised by afording these
celsnt rods at such low rates. the greatest attention has
given to their construction be readily attached
The astonishing OF the negative magnets In dischag
ing the air OF Its opposite elements has been clearly demon
sraed by the Eectrometer when unmagnetized points
have shown but slight results though placed under the
conditions In fact they gather and silently discharge
electricity from the atmosphere when would scarcely
suspect any being present.
These being by double letters pa
tent You hereby cautioned against laying yourselves
liable by purchasing Of those who are not authorized or
who substituting inferior limitations. All agents duly
appointed can show their certificates Have good rods or
none. CHARLES W. HEYDON,
Washington City
do hereby certify that have app lied various powerful
chemical reagents spratts Patent Points for Lightning
that the results these experiments convince
thereby preserve the extremity harpa condition most
sena protection against lightning The reagents used
dunn Common salt acetic acid suphuric acid and hydro
chlorc acid With the first, there action on the
metal with the several acids there sgha fact
sufficient 10 show that atmospheric Influences would have
sensible effect.
JOHNLEooSTE, Prof Of Nat Phil ct Chem.
UNIVERSITY or Ga, October 5, 1885,
The Lightning Conductors of Mr. spratt offered to me,
well calculated to perform the Office for which they
Intended Yours, truly, Prof RoBT, PETER.
LEXINGTON, KY, February 20, 1850
CHICAGO, September 3, 1901
This certify that have examined somewhat erit.
cay James spratts Patent Lightning Rods and that
OF opinion that II 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. z. BLANEY.
AUGUSTA (GA) November IL, 1850.
This will certify that have examined the Lightning
Rods, Metallic Points and Isoating Attachments, manu-.
featured by Mr. Spra and regard them constructed In
conformity the general laws of the electric fluid and the
metallic compound constituting the Points, promising,
from the result of tests TO which they submit
ted resist years the action Of those atmospheric
most likely to csrrode them. A. MEANS,
Prof Phys Sc Emory College Ca and Prof Chem. and
Pharm. Medical College, Ga.
The Lightning Conductors put mp by Mr. Henry NJ Smith,
Of this city, the plan of Mr. sprat appear to to be
well DEVISED and in point Of mechanical construction
the best have
It Is TO be- hoped that the use of may become
general rs an important auxiliary defence against danger
which be regarded Of ordinary magnitude TO
which all buildings are liable X. sIIIMAN, Jr,
Prof Of Chem. in the University Of Louisville.
LOUISVILLE, January e 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
eth street, will be promptly attended to- or at GEORGE
BELLS Alexandria, Va OF King and st. Asaph SITS
sp14-u