Improvements in Fine Adjustment Mechanism for Microscopes.
Year: 1891

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Date of Application, 21st Sept.. 1891
Complete Specification Loft 10th June 1892-Accepted. 23rd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Fine Adjustment Mechanism for Microscopes.
CHARLES THOMAS PARTRIDGE No. 1 New Charles Street City Road London,
Middlesex, Scientific Instrument Maker, do hereby declare the nature of this
invention to be as follows:-
My.invention relates to an improvement in connection with that portion of a
microscope usually termed the fine adjustment or slow motion for focusing. My
improvement in the fine adjustment of the microscope consists in the combination
of a screw with a large flange (preferably milled on the edge) which screws into
a spur or worm wheel, which spur or worm wheel is made to revolve by means of a
worm or endless screw, both flanged screw and spur or worm wheel working round
a pin through the centre, which aforesaid pin is supported on a bracket.
My invention will allow of the flanged screw being used independently for a first
fine adjustment while for the finest adjustment the flanged milled screw is actuated
by the worm wheel, which is made to turn by the worm or endless screw.
Dated this 21st day of September 1891.
CHARLES THOMAS PARTRIDGE.
COMPLETE SPECIFICATION.
Improvements in Fine Adjustment Mechanism for Microscopes.
CHARLES THOMAS PARTRIDGE No. 1 New Charles Street City Road London,
Photographic Optical & General Scientific Instrument Maker do hereby declare
the nature of this invention and in what manner the same .is to be performed,
to be particularly described and ascertained in and by the following statement :-
My invention relates to an improvement in connection with that portion of a
My
microscope usually termed the fine adjustment or slow motion for focusing.
improvements aforesaid consist in the combination of a screw with a large flange
(preferably milled on the edge) which screws into a spur or worm wheel, which
screw, both
spur or worm wheel is made to revolve by means of a worm or endless
flanged screw and spur or worm wheel working round a pin through the centre
which aforesaid pin is supported on a bracket.
My invention will allow of the flanged screw being used independently for a fine
adjustment while for the finest adjustment the flanged milled screw is actuated by
the worm wheel which is made to turn by the worm or endless screw.
In the accompanying drawings,
Fig. 1 & 2 shew respectively an elevation & plan of my apparatus.
Fig. 3 a section through the centre of same.
Fig. 4 a plan of the worm wheel & endless screw arrangement.
Similar letters denote similar parts.
A is the bracket. B the worm wheel. C the flanged screw.
screw. E the guide pin. F the cover for worm wheel.
D the endless
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner it is to be performed, I declare that what I
claim is
1st. The flanged milled screw C. working internally in the worm wheel B. as

page_text: also worm wheel itself as applied to the fine adjustment of the microscope optical
tube.
2nd. The application of the motion B. & C in front of or at the side bottom or
top, or behind the rack motion of microscope.
Dated this 10th day of June 1892.
CHARLES THOMAS PARTRIDGE.