AN IMPROVEMENT IN CRANES
Year: 1857

page_text: Sealed the 21st July 1857, and dated the 28th January 1857.
PROVISIONAL SPECIFICATION left by the said Walter Henderson
Sisterson at the Office of the Commissioners of Patents, with his
Petition, on the 28th January 1857.
I, WALTER HENDERSON SISTERSON, of Southwark, in the County of Surrey,
Engineer, do hereby declaro the nature of the said Invention for "AN
IMPROVEMENT IN CRANES," to be as follows:-
My Invention consists in forming the jib of cranes in two parts, and in
connecting them in such manner that one part may slide upon and along the
other, whereby the jib may be considerably lengthened.
In confined places, such as streets, the crane will occupy but little space
until required for use, when the jib being protruded will stretch. sufliciently
far out to load and unload wagons, and perform the other duties required of
a crane.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Walter Henderson Sisterson: in the Great Seal Patent
Office on the 28th July 1857.
TO ALL TO WHOM THESE PRESENTS' SHALL COME, I, WALTER
HENDERSON SISTERSON, of Southwark; in the County of Surrey, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-eighth day of January, in the year of our
Lord One thousand eight hundred and fifty-seven, in the twentieth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Walter Henderson Sisterson, Her special licence that I, the said
Walter, Henderson Sisterson, my executors, administrators, and assigns, or
such others as I, the said Walter Henderson Sisterson, my executors,
administrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "AN IMPROVEMENT IN CRANES," upon the
condition (amongst others) that I, the said Walter Henderson Sisterson, my
executors or administrators, by an instrument in writing under my, or their,
or one of their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Walter Henderson Sisterson, do hereby
declare the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement thereof, reference being, had to the Drawings hereunto annexed;
that is to say:-
My Invention consists in forming the jib of cranes in two parts, and in
connecting them in such manner that one part may slide upon and along or
out of the other, whereby the jib may be considerably lengthened.
In confind places, such as streets,, the crane will occupy but little space
until required for use, when the jib being protruded will stretch sufficiently
far out' to load and unload waggons, and perform the other duties required of
a crane.
Figure 1 is a side elevation, and Figure 2 a back view of a crane, with one

page_text: of my sliding elongating jibs. A, A, is the crane post. The jib is composed
of two plates B, B, which being bolted together form a fixed shaft, and of a
central shaft C, free to slide up and down between the plates of the fixed
shaft. The tension bars D, D, carry a friction roller E, over which the sliding
shaft or jib travels. A link or eye F is bolted to the lower end of the sliding
shaft, to receive one end of a chain or rope G, which is carried over a sheave H,
turning on an axis a in bearings b, bolted on the fixed shaft B, and on to the
barrel of a windlass I. In order to elongate the jib, the chain G is wound
upon the barrel by throwing the pinion c on the shaft d into gear with the
toothed wheel f, and turning the crank handles g, g. The paul h enters tho
teeth of the ratchet wheel i, and keeps the jib in the position required. On
releasing the paul and reversing the handles, the sliding shaft will return to
the position shewn at Figure 1, when the pinion c should be thrown out of
gear with the toothed wheel f. k, k, are guide rollers, connected to the
bottom of the sliding shaft.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim as my improve-
ment in cranes the constructing of the jibs thereof of two shafts, one being
free to slide out from the other, in order that the jibs may be elongated when
required.
In witness whereof, I, the said Walter Henderson Sisterson, have here-
unto set my hand and seal, this Twenty-eighth day of July, One
'thousand eight hundred and fifty-seven.
W. H. SISTERSON. (L.S.)