UNITED STATES PATENT OFFICE
GEO. W. OTIS, OF LYNN, MASSACHUSETTS.
IMPROVEMENT IN INSULATORS FOR LIGHTNING-RODS.
Specification forming part of Letters Patent No. 8,316, dated August 26, 1851.
To all whom it may concern:
it. known that I, GEORGE W. OTIS,
of Lynn, in the county of Essex and State of Massachusetts, have
invented a new and Improved Mode of Attaching Lightning-Rods to
Buildings by Means of Glass Isolators; and I do hereby declare that the
following is a full and exact description.
invention consists of three parts, to wit: first, a solid glass cylinder
second, a metallic point or conductor, third, a wooden collar.
cylinder is one and a half inch in diameter and two inches in length,
having in one end bore three quarters of an inch in depth in which to
fix said point or conductor, and around the edge of the other end a lip
or flange one-eighth of an inch in width and one-quarter of an inch in
thickness, by which to be kept in its place by the collar.
point or conductor is fixed in said bore in the cylinder, and extends
horizontally therefrom four inches. The
first three-quarters of an inch thereof from the end of the cylinder is
square, having all opening through for the passage of the lightning-rod.
Thence it tapers to a point.
Said collar is round, and is made, by means of a circular groove inside, to fit over and around said cylinder and lip or flange, so that its base and the base of said cylinder
present a uniform surface.
three parts being thus put together constitute the isolator, which is to
be fastened rectangularly to the building by means of screws or nails
throng the collar. The
lighting-rod is then passed up the side of the building through said
opening in the point or conductor.
office of the collar is to fasten the cylinder and point or conductor to
office of the glass cylinder is, by isolation, to prevent the passage of
electricity from the lightning-rod to the building.
office of the metallic point or conductor is to secure the lightning-rod
and to divert and dissipate the electricity.
many of the isolators are to be used in as may necessary to support the
I claim as my invention is--
insulated support and point for lightning-rods, consisting of the
insulated point and opening in its shank, the insulating-cylinder of
glass, with its lip or flange, and the wooden collar for securing the
whole to the building, all as described.
SETH J. THOMAS.