126 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
octagonal form of Marshall’s box foot was retained, but the legs were 
slightly scrolled, instead of being straight, as in the form figured by 
Smith in his ‘ Optics,’ 1738. Jones, who made a Culpeper Microscope in 
1797, placed it on a square box foot, and scrolled the legs more highly, 
probably for the purpose of giving more room for manipulating the stage 
Fig. 3. Fig. 4. 
and the mirror. In the most elaborate form of this kind of Microscope 
the body is made of brass, and is fitted with raok-and-pinion coarse 
adjustment, a fine example of which was lately presented to the Society 
by Mr. More (fig. 4). The instrument now before the meeting was a very 
early example with scrolled legs. 
How to Make a Microscope Stand.* — Mr. W. E. Field gives instruc- 
tions, illustrated by numerous working drawings, for the construction of 
a high-class stand ; the various operations, from the making of patterns 
to the finishing of the instrument, being described, especially the details 
of the metalwork for each part. 
(3) Illuminating: and other Apparatus. 
Repsold’s New Self-Registering Micrometer.! — A. Kowalski de- 
scribes the results of readings taken by an application of this device to 
an astronomical transit instrument. The principle of the micrometer is 
that a clockwork arrangement releases or arrests a thread movable over 
the fixed micrometer threads ; and its great value is the almost complete 
elimination of the correction due to personal equation. The author 
gives an account of his experience, which seems decidedly favourable. 
* English Mechanic, lxvi. (1897) pp. 171, 193, 217, 239, 263, 287 (31 figs.). 
f Bull, Acad. Imp. Sci. St. Petersbourg, May 1897. 
