PROCEEDINGS OF THE SOCIETY. 
675 
fine adjustment screw worked upon a lever, and this in turn upon another 
lever, with a screw adjustment to take up the wear. The indicator to 
the fine adjustment, instead of being fixed, as usual, was movable, so 
that it could be turned to zero at any time required ; this greatly facili- 
tated the reading of the divisions on the head of the fine adjustment 
screw. The instrument was fitted with the English staudard substage, 
a cut stage and sliding bar, and the trunnion axis was placed above the 
stage to ensure a better balance. Two other Microscopes of Reichert’s 
were also exhibited, to one of which attention was particularly directed 
as being a Student’s Microscope with no fine adjustment, but in which 
his suggestion had been carried out of using an ordinary dissecting 
loup as a substage condenser ; this could be taken out and used as a 
dissecting lens if so desired. Another Microscope of similar design 
but larger size was also shown. 
Mr. Conrad Beck did not think there was anything new in having the 
setting-up screw for the coarse adjustment. He also asked the President 
what was understood to be the size of the English standard substage. 
Dr. Dallinger said that Reichert claimed to be the only Continental 
maker who sprung his Microscope fittings, so that, as in English instru- 
ments, they could be readily compensated for wear. 
Mr. Watson Baker was very glad indeed to know that the Conti- 
nental maker had adopted the standard size for his substage fitting. The 
•constant variations met wfith were the distraction alike of the makers 
and the microscopists. If any one could persuade other Continental 
opticians to move in this direction, he would earn the gratitude and 
lengthen the lives of English opticians and English microscopists. 
Dr. Measures said that Reichert was certainly not the only one who 
made an adjusting screw for the coarse adjustment. Zeiss also has had 
such a system in use in all stands for over four years. 
Dr. Dallinger thought it would be interesting to know when this 
was first done, because at the present time Reichert gave out that he 
was the only one who had done it. 
On the motion of the President the thanks of the Society were voted 
to Dr. Measures and Mr. Reichert for these exhibits. 
The President exhibited a Watson’s Edinburgh Student’s Microscope 
which during the vacation had been fitted with the new stepped rack- 
work. He asked the Fellows to try it and detect for themselves that there 
was no loss of time, even though the pinion was pressed but lightly into 
the rack. 
The Microscope had also been fitted with Watson’s new fine adjust- 
ment to the substage, the head of the pinion being brought out clear of 
the stage. 
The President said that he would mention for the benefit of manu- 
facturing opticians that a French chemist had introduced an alloy of 
aluminium and tungstate ; this was now used by engineers in the 
manufacture of motor cars, and he had little doubt that it would prove 
very useful in Microscope construction. It possessed some valuable 
qualities that aluminium did not have, and it was nearly as light as that 
metal. He thought that the heads of the coarse adjustment pinion, as 
