Beck_, on Universal Screw. 
97 
yond the ficrew^ was that originally recommended ; but as the 
committee were informed by the author of the paper^ as well 
as by another leading firm, that it would be more convenient 
in practice to continue the inside screw to the full extent that 
the object-glass enters, and that it was their intention to do 
so, the committee thought that it would be better that their 
recommendation should in this respect be rendered conform- 
able to the existing practice. It was also considered that this 
course would supersede the influence of unavoidable minute 
differences in the gauge-taps ; while it would not, in any de- 
gree, interfere with the fitting of the object-glasses. 
It may, in conclusion, be remarked, that the plan last 
recommended by the Microscopical Society has been found 
to work well amongst those who have adopted it, their 
object-glasses being interchangeable ; and that several mi- 
croscopes, to which the standard screw has been applied by 
the author of the paper, have since been altered in other 
hands, so as to receive the proposed gauge-tap, and conse- 
quently the object-glasses of all the principal makers; and, 
further, that the slightly increased looseness of fitting of their 
own object-glasses has not been found to occasion any prac- 
tical inconvenience. 
