Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-11-05
Protection from Lightning.

VNiE undersigned being the duly appointed Agent OF
SPRATT's ELECTRICIAN ELECTRO METALLURGIsT LIGHT
ROD MANUFAcToRr Covngton, Kentucky, begs to offer
these superior Rods Carbonzed Anneaed
Iron with Zinc Protectors and Electroposive elements
combined in their manufacturer thus rendering them equal
copper conductors They in tcneet lengths, with
brass connecting joints, entire
style of metallic (patened) attachments brick
frame buildings also glass isoaters Of novel and inge
NOUS construction patented forming lock; the whole
mounted with solid platinum silver point (patented)
inches long, surrounded at tho base with three ang
ordinary extent Of dschargg the opposite elements Of tbs
most fearful Thunderstorm and embrace the entire perec
non q science up % Inc present me ths whole sons.
presented to the public. .#t
Safety has not been compromised by aordng these ex
ceent rods at such low rates. the greatest attention has
been given to their construction be readily attached
The astonishing power Of the negative magnets in dischag
ing the air OF its opposite elements has been clearly demon
strated by the Eectrometer when 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. Ht
tent hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized
appointed show their certificates Have good rods or
| none. CHARLES w. HEYDON,
Washington City
do hereby certify that have app lied various powerful
chemical reagents to spras Patent Points for lightning
that they will resist the action of atmospheric causes and
thereby the extremity condition most
senal to protection against lightning The reagents used
in the above experiments solution Of chloride of
dunn, common SALT acetic acid suphuric acid and hydro
chlorc acid With the first, there action on the
metal with the several acids there very stga fact
sufficient to show that atmospheric influences would have
sensible effect. 4E@a /,
JoHNLECoNTE, Prof. Of Nat Phil etChem,
UNIVERSITY OF Ga, October 8, 1850. 80
The Lightning Conductors of Mr. spratt offered TO me-
are well calculated TO perform the Office for which they
LEXINGTON, KY, February 20, 1850
CHICAGO September 8, 1851
This may certify that have examined somewhat critj
cay James Spratts Patent Lightning Rods and that
of opinion that it is constructed scientific principles For
combining durability, chespness, and efficacy, deem Il
equal and think SUPERIOR to any other rod offered
for my inspection Prof JAS. " 2. BLANEY,
AUGUSTA, (Ga) November Ii, 1850,
This will certify that have examined the Lightning
Rods, Metallic Points, and Isolatng Attachments manu-
featured by Mr. Spra and regard them constructed
conformity to the general laws of tho electric uid the
metallic compound constituting the Points as promising
from the result Of several tess to which they submit
ted TO resist for the action of those atmospheric causes
most likely to corrode them A. MEANS,
Prof Phys. &c., Emory College, Ga, aud Prof Chem and
Pharm. Medical College. Ga. n -
The Lightning Conductors put up by Mr. Henry NJ Smith,
of this city, the plan Of Mr. Spratt appear to be
very well devised and in point Of mechanical construction
the best have seen.
1t IL 10 be hoped that the these Rods may become
general important auxiliary defence against danger
which must be regarded Of ordinary magnitude TO
which all buildings arc liable. Il. sIL1MAN, Jr.,
Prof Of Chem. in the University of Louisville.
LOUISVILLE, January n, 1851.
All orders left at ANDREW DUFfYs stove ManufActory
9TH street, viii be promptly attended to; or at GEOKGE
BELLS, Alexandria, Va corner of King and st. Asaph ss
ap14-u