This microscope has a Jackson limb with a direct acting screw nosepiece fine adjustment. The main tube and the sub-stage focus by rack and pinion. Among the accessories are two eyepieces, three objectives with brass canisters, a live box, a brass-bound eyepiece micrometer, a sub-stage dark well holder with two wells, two Lieberkuhn reflectors with caps, a sub-stage polarizer, an eyepiece mounting Nicol analyzer prism, a stage forceps, a sub-stage aperture wheel, a sub-stage condenser, and a limb mounting side reflector. Within the storage
case are two boxes. One is for prepared microscope slides and the
other contains the accessories. The objectives
predate the RMS thread.
This microscope was
made by the British instrument maker Thomas Cooke (1807-1868). Most of
the instruments he made after 1855 are signed T.
Cooke & Sons, not just T. Cooke,
York as on this microscope. On that basis, this
microscope should date prior to 1855. In addition,
the objectives on this microscope predate the use of
the RMS thread (formalized in 1858). After the death
of Thomas Cooke in 1868, the firm was taken over by
his sons and retained the name T. Cooke &
Sons. By 1922 the firm was named Cooke,
Troughton & Simms.
Microscopes made by
Thomas Cooke are rather uncommon. Another microscope made by Thomas
Cooke dated 1850 is held by the York Museum