IMPROVEMENTS IN SCALES AND WEIGHTS FOR ANALYTICAL PURPOSES
Year: 1875

page_text: LETTERS PATENT to Peter Jensen, of Chancery Lane, London, for the
Invention of "IMPROVEMENTS IN SCALES AND WEIGHTS FOR ANALYTICAL
PURPOSES." -A communication from abroad by Ferdinand Sartorius,
of Goettingen, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the
Office of the Commissioners of Patents, with his Petition, on
the 10th March 1875.
I, PETER JENSEN, of Chancery Lane, London, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN SCALES AND WEIGHTS FOR
ANALYTICAL PURPOSES," (a communication to me from abroad by Ferdinand
Sartorius, of Goettingen, in the German Empire,) to be as follows:-
The beam of the scales is short, in one piece, and of aluminium.
The apparatus is fixed on a marble plate which is put in level by a
foot and by two screws as usual. The centre column carries at the top
two short upright columns united by a cross bar, which carries the two

page_text: agate plates for the centre knife edge to bear on, and from which a
pointed weight is suspended that coincides with a fixed projecting point
on the marble plate.
The ends of the beam have knife edges for the suspension of metallic
loops for attachment of the scales, and in the middle there is a downward
projecting hand or tongue. In the prolongation of the axis of the beam
a fine wire is stretched between the central knife edge, and a sector piece
turning by sector teeth at its axis, which teeth gear into a pinion on a
stud projecting from the aforesaid cross bar, and ending in a cone which
is ground into a socket formed in a spindle passing out through the glass
wall of the box, and outside same provided with a knob.
spindles adhere to one another by friction.
The two
The mechanism for arresting the swinging of the apparatus consists of
three parts, that for stopping the beam, that for stopping the loops
suspended from the same, and that for stopping the scales.
As to the first, there is on each side or end of the beam a stud which has
a strap for the beam to rest in when taking its normal position. These
two studs are fastened vertically on a plate which is guided by the afore-
said two short columns, and has fastened to it a tube passing into the
hollow central supporting column. Through the tube passes a central half
round spindle down through the marble table, and there pressing against
one of a pair of levers, the outer ends of which are cranked and work
against two cams on a spindle which can be turned by a handle. To
stop the beam one of the said cams which is pressed against the cranked
lever by means of a spiral spring on the tube is turned, thus causing the
depression of the corresponding lever and the spiral spring drawn down
the tube.
As to the second, the cross pieces on which unite the ends of the
loops, and on which the agate plates are fastened have at each end two
small screws, the ends of which rest on pegs, one of these is conically
recessed in its end so that the end of the small screw always comes in
the axis of the peg, the other peg has on its end surface a recess so that
the cross piece always must take a normal position relatively to the
beam.
The cross bar which carries the loops for the scales is guided by the

page_text: the spindle passing down through the said column, the lower end of this.
spindle is halved in order to make room for another half round rod. A
spiral spring which presses against the bottom end of the tube in the
column, and is kept up by a stop ring which by a set screw is held on
the halved part of the spindle passing down through the column; this
spiral spring causes the spindle to follow the aforesaid cranked lever.
The scales are stopped by means of the eccentrics or cams which raise
two small tables against the scales, the tables having guides passing
loosely through the marble table so as to drop by their own weight.
On turning the handle on the cam spindle, the scales and loops are
first arrested and then the beam on releasing the beam comes last.
SPECIFICATION filed in pursuance of the conditions of the Letters
Patent, and of an Order of the Lord Chancellor, by the said Peter
Jensen in the Great Seal Patent Office on the 9th October 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
JENSEN, of Chancery Lane, London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent bearing date the Tenth day of March, in the year of our
Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Peter Jensen, Her special licence
that I, the said Peter Jensen, my executors, administrators, and assigns,
or such others as I, the said Peter Jensen, 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 "IMPROVEMENTS IN SCALES AND WEIGHTS
FOR ANALYTICAL PURPOSES," (a communication to me from abroad by
Ferdinand Sartorius, of Goettingen, in the German Empire), upon the
condition (amongst others) that I, the said Peter Jensen, 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

page_text: to be performed, and cause the same to be filed in the Great Scal
Patent Office within seven calendar months next and immediately after
the date of the said Letters Patent.
NOW KNOW YE, that I, the said Peter Jensen, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying Drawings
and to the letters of reference marked thercon, that is to say :-
According to this Invention the beam of the scales is made short, in
one piece, and of aluminium.
The apparatus is fixed on a marble plate which is put in level by a
foot and by two screws as usual. The centre column carries at the top
two short upright columns united by a cross bar, which carries the two
agate plates for the centre knife edge to bear on, and from which a
pointed weight is suspended that coincides with a fixed projecting point
on the marble plate.
The ends of the beam have knife edges for the suspension of metallic
loops for attachment of the scales, and in the middle there is a down-
ward projecting hand or tongue. In the prolongation of the axis of the
beam a fine wire is stretched between the central knife edge, and a
sector piece turning by sector teeth at its axis, which teeth gear into a
pinion on a stud projecting from the aforesaid cross bar, and ending in
a cone which is ground into a socket formed in a spindle passing out
through the glass wall of the box, and outside same provided with a
knob, the two spindles adhere to one another by friction.
Fig. 1 is a side elevation of scales constructed according to this
Invention; Fig. 2 is plan of same; Fig. 3 is a section through A, B,
Fig. 2, and Fig. 4 is a section through C, D, Fig. 2. N is the marble
plate or table on which the instrument is fixed, X is a foot or leg which
serves to put it in level together with two screws at the front edge of
the plate N, but not shown here. The column K at its upper end carries
two studs G, G, which are united by the cross bar F that carries the two
small plates 3, y, whereon the knife edge c of the beam E rests, and
whereto the plumb line and bob s is attached ; c is the rider, and d is a
spindle with a small screw, the spindle & can turn and can be set in any
required position by nut and check nut, whereby the scales may be
exactly poised; ", ", are knife edges at the end of the beam for

page_text: arrested by the cam P and the spiral spring p on the tube Z; this spring
is held by the ring o and keeps the lever 8 against the cam P. When
the lever goes down by the turning of the lever, the spiral will draw the
tube Z down and the beam be released again.
The mechanism for arresting the loops or staples L is constructed
according to the same principle as the one just described. The cross
pieces which unite the sides of the staples or loops Land on which the
agate plates are fixed have each at their ends two small screws, the ends
of which abut against studs a fastened on the plate K. In order to
ensure the arresting of the loops in the right place, one of the said studs
is formed with a somewhat conical depression at the end, so that the end
of one of the screws always fits into the axis of the stud, the other stud
has a groove at its end whereby a always keeps a normal position
relatively to the beam. The plates H and F are guided by the two rods
G, G, and moved by the rod y which is fast in the tube Z, and the end 1
of which is half cut away (see Fig. 4) to make room for the half round
piece ; the spring 7 presses against the tube Z and is held by the
adjustable ring 7 on y; it causes the rod y to follow the lever 8. The
eccentric Q moves the lever s exactly as in the case of the other
lever s.
.
The scales are stopped by means of the eccentrics Q which raise the
two small tables M against the scales, the tables M being guided by
their stem working in the glands U fastened in the marble table, the
glands are such a loose fit that the stems drop through them by their
own weight when the eccentrics allow it. The stems have at their
lower ends set screws for exact adjustment against the eccentrics.
On turning the handle on the cam spindle the scales L', L', and loops
L, L. are first stopped and then the beam (by the cam P).
In witness whercof, I, the said Peter Jensen, havo hereunto set
my hand and scal, this Ninth day of October, in the year of our
Lord One thousand eight hundred and seventy-five.
DEAKD
זוTTANCT
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