A. GENERALL PORTABLE MICROSCOPE, OF A STRUCTURE INTIRELY NEW AND DIFFERENT FROM ANY NOW IN USE, WHICH, WITH PARTS FOR TRANSPARENT AND OPAKE BODIES, CONVENIENCES FOR LIVING CREATURES, AND A STAND AND REFLECTING SPECULUM, ARE CONTAINED IN A CASE NOT EX- CEADING SIX CUBICE INCHES, AND IS SO CONTRIVED AS "THE INSTANT IT IS TAKEN OUT TO BE READY FOR USE, WITHOUT THE TROUBLE OF SCREWING AND UNSCREWING ANY PART, AND MEASURES BY A SCALE THE FOCALL DISTANCE OF EACH LENS, THEREBY GIVING THE REALL AND APPARENT MAGNITUDES OF OBJECTS, HAVING ALSO REFLECTING MIRRORS FOR ILLUMINATING DARK BODIES, AND IS APPLICABLE TO ALL THE PURPOSES WHICH THE NATURE OF MICROSCOPES ADMITTS
Year: 1743

page_text: LINDSAY'S SPECIFICATION.
WHEREAS His Majesty, by His Letters Patent under the Great Seal
of Great Britain, dated the Seventeenth day of February; in the sixteenth
year of His reign, did grant unto me, George Lindsay, of the Parish
of Saint Martin's in the Fields, in the County of Middlesex, Watchmaker,
my executors, administrators, and assignies, the sole use and benefitt of
making and vending "A. GENERALL PORTABLE MICROSCOPE, OF A STRUCTURE
INTIRELY NEW AND DIFFERENT FROM ANY NOW IN USE, WHICH, WITH PARTS
FOR TRANSPARENT AND OPAKE BODIES, CONVENIENCES FOR LIVING CREATURES,
AND A STAND AND REFLECTING SPECULUM, ARE CONTAINED IN A CASE NOT EX-
CEADING SIX CUBICE INCHES, AND IS SO CONTRIVED AS "THE INSTANT IT IS
TAKEN OUT TO BE READY FOR USE, WITHOUT THE TROUBLE OF SCREWING AND
UNSCREWING ANY PART, AND MEASURES BY A SCALE THE FOCALL DISTANCE
OF EACH LENS, THEREBY GIVING THE REALL AND APPARENT MAGNITUDES OF
OBJECTS, HAVING ALSO REFLECTING MIRRORS FOR ILLUMINATING DARK BODIES, AND
IS APPLICABLE TO ALL THE PURPOSES WHICH THE NATURE OF MICROSCOPES ADMITTS,"
invented, contrived, and-found out by me, the said George Lindsay, for and
during the term of fourteen years, within that part of Great Britain called
England, the Dominion of Wales, and. Towne of Berwick-upon-Tweed;
in which said Patent there is a proviso, that if I, the said George
Lindsay, shall not particularly describe and ascertaine the nature of the said
Invention, and in what manner the same is to be performed, by an instrument

page_text: in writing under my hand and seal, and cause the same to be inrolled in Dis
Majesty's High Court of Chancery within four callender months next after
the date of the said Letters Patent, that the said Letters Patent, and all
libertyes and advantages whatsoever thereby granted, shall utterly cease,
determine, and become void, anything therein contained to the contrary
notwithstanding.
NOW KNOW ALL MEN BY THESE PRESENTS, that I, the said
George Lindsay, pursuant to the said proviso, do hereby describe, delineate,
and ascertaine, the nature and form of my said Invention to consist as in the
Plan thereof hereunto annexed, and as the said Invention and the said Plan
thereof is particularly described in the words and figures following (that is
to say) :-
Figure 1 represents the microscope ready for use. A, I call the head of the
instrument. To this is fixed a plate on which the object part B slides, and is
moved backwards or forwards by the leaver C, which turns out and folds
in with the rest. D is the handle, to turn up or down occasionally. E is a
speculum, to reflect light on the object, fitted in a sockett at the end of the
sliding barr F. G, G, are sliders in which are sett the glasses, whose numbers
appear at the top of the head when each successively is brought before the
aperture I, and the focal distance of each glass is denoted by the number over
each division on the scale C, by the Index 6. K, K, K, are three peices which
form a stand for the instrument. N, O, are a pair of tongs, and a spring
tube to hold them, whose tail fitts into the cavity represented at E, in Figure 2d,
in which situation it is an instrument for opake bodies; and the mirrors (T and
V), one of which is a sphericall, the other a conc, are to be applyed as repre-
sented at T in Figure 2d, to illuminate the side of the object next the eye.
P is a case to contain ivory sliders for objects; and one of its sides being
joined to another plate S, as in Figure 3d, is for confining a fish, &c., to view
the circulation of the blood. These are the most essential parts of the said
Invention or microscope. The materialls of which it is made are such as are
common to all mathematicall and opticall instruments.
In witness whereof, I, the said George Lindsay, have hereunto sett my
hand and seal, this Thirty-first day of May, in the sixteenth year of
the reign of our Sovereign Lord George the Second, by the grace
of God of Great Britain, France, and Ireland King, Defender of the
Faith, &c., and in the year of our Lord One thousand seven
hundred and forty-three.

page_text: AND BE IT REMEMBRED, that on the First day of June, One thou-
sand seven hundred and forty-three, the aforesaid George Lindsay came before
our Lord the King in His Chancery, and acknowledged the Writing above said,
and all and every thing therein contained and specified, in form aforesaid.
5 And also the said Writing was stamped according to the form of the Statute
made and provided in the sixth year of the reign of the late King William
and Queen Mary, and so forth.
Inrolled the Fourth day of June in the year above written