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EVOLUTION OF THE BULLOCH CONGRESS MICROSCOPE STAND:

FIRST FORM c. 1877

SOME INTRODUCTORY REMARKS:
This page contains engravings of the first version of Walter Bulloch's Congress Microscope. Initially referred to as the A 1, Large Best stand, he changed the name after a meeting of the Microscopical Congress in August of 1878. For a while it was referred to as the 'A 1 Congress' and eventually just as the 'Congress'

This microscope still used a fusee chain drive for the Y (front-back or up-down) axis for the mechanical stage. It also had a worm screw drive in the back of the limb to change the obliquity of the substage by small amounts if desired.