182 THE NORTHERN MICROSCOPIST. 
as the edges of the slip are at right angles to each other the cen- 
tering must be absolutely accurate, but not otherwise. 
On the introduction of this machine several operators objected 
to the method of holding the slip, and Kinné soon afterwards 
introduced his modification, in which the two corner clips were 
drawn together and made to grip the glass slip by means of an 
indiarubber band or spiral spring. 
In 1876, a notice appeared that Mr. Charles Butterworth, of 
Shaw, near Oldham, exhibited at the annual soiree of the Oldham 
Microscopical Society a turntable capable of making cells of either 
circular or elliptical form ; and also by its aid a thin cover glass 
could be held in position on a cell, whilst the various rings of 
cement or varnish were put on. 
In 1879, Mr. Rolfe re-invented Kinné’s turntable, and described 
it before the members of the Quekett Club, adding at the same 
time an idea of his own, which was quite novel. 
Fig. 32. 
The year 1880 saw the introduction of two turntables, the first 
by Mr. Dunning, which has since been made by Mr. Swift, and the 
second introduced by Dr. Matthews. Mr. Dunning’s turntable 
will take any slides up to two inches in width, and will also serve 
for retouching slides the circles upon which are not truly central. 
Dr. Matthews’s last production is to be found fully described in 
Vol. III., page 717, of the Journal of the Royal Microscopical Society, 
its object being different to any we have previously considered. The 
improvement consists (or is said to consist) in means for setting the 
table in motion, and is so arranged that by pulling down a cord a 
rotary motion is imparted to a pulley, which acts upon the table 
when moving in one direction only. After pulling the cord to its 
full extent a spring carries it back again, turning round the pulley 
and pawl in the reverse direction, when it is ready for a second 
forward movement, the weight and momentum of the table being 
sufficient to maintain its forward motion during the reverse action 
of the pulley and pawl. 
