Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-04
Protection from lightning.

nNHE undersigned being the duly appointed Agent OF
sPRArr's ELECTRICIAN ELECTRO METALLuRGIsT LieHr
SdRoD MANDATORY Coyngton, Kentucky, begs to offer
these superior Rods OF Spratwied Carbonized Anneaed
Iron with Protectors and Retrospective elements
combined in their manufacturer thus rendering them equal
to copper conductors They in eneet lengths, with
brass connecting joints an entire
new style Of metallic patented attachments for brick or
frame buildings also, glass isoaters, Of novel and inge
NOUS construction, patented forming lock; the whole
mounted with solid platinum silver point, patened
twelve inches long, surrounded ut the base with three angu
lar negative magnets which possess the power TO an extra
most fearful Thunderstorm embrace the entire peric
ton OF science to the present times the whole consu
ting the most and perfect silent conductor ever
presented to the public.
Safety has not been compromised by aording these
celent rods at such low rates. the greatest attention has
been given to their construction TO be readily attached
The astonishing power of the negative magnets in discar
ing the air OF its opposite elements has been clearly demon
strated by the Eectrometer when unmngnetzed 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 10y double letters pa
eut you hereby cautioned against laying yourselves
liable by purchasing of those who not authorized, or
who are substituting inferior limitations. All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HESDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to sprat Patent Points for Lightning
Rods and that the results Of these convince
that they will resist the action Of atmospheric causes and
thereby preserve the extremity sharpa condition most
sentia to protection against lightning The reagents used
dunn Common sat acec acid sulphurc acid and hydro
chlOrc acid With the first, there action the
metal with the several acids, there very Sgha fact
sufficient to show that atmospheric influences would have
sensible effect LEI
JOHN LECoNTE, Prof of Nat. Phil. etChem.
UNIVERSITY OF GA, October 8, 1850.
The Lightning Conductors of Mr. spratt offered to me-
well calculated perform the office for which they
Intended Yours truly. Prof 1s0BT. PETER.
LEXINGTON, KY, February 20, 1850
CHICAGO September 3, 1850.
This may certify that have examined somewhat crit.
cay Spratts Patent Lightning Rods, and that am
combining durability, cheapness, and efficacy, deem 1t
equal and think SUPERIOR to any other rod ever offered
for my inspection. Prot. JAS. " q. BLANEY.
AUGUSTA, (GA) November IL, 1850.
This will certify that have examined The lightning
Rods, Metallic Points, and Isoating Attachments, manu-
featured by Sprat and regard them constructed in
conformity to the general laws of the electric uid and the
metallic compound constituting the Points, as promising,
the result several tests to which they submit
ted to resist for the action OF those causes
most likely to corrode them. A. MEANS,
Prof Phys &c., Emory College, Ca and Prof Chem and
Pharm., Medical College, Ga.
The Lightning Conductors put by Mr. Henry NJ Smith,
of this city the plan of Mr. Spra appear TO me to be
very well devised and in point of mechanical construction,
the best have ever seen.
1t Is hoped that the Of these Rods may become
general as an important auxiliary defence against danger
which be regarded of ordinary magnitude, to
which all buildings are liable. II. SILIMAN, Jr,
Prof of Chem. in the University of Louisville.
LOUISVILLE, January 27 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
18th street, will be promptly attended to; or at GEORGE
BELl Alexandria, Va, of King and St Asaph sts
ap lift