us completely fills two
functions: First, that of multiplying the angle of rotation and thereby
increasing the apparent sensitiveness of the scale, and, second, that of
overcoming the effect of change of level. The secondary beam may be
dispensed with if a multiplier is not needed, and the secondary truss,
_t_, with its standard and counterpoise, H, used alone to counteract the
effect of change of level. Fig. 5 shows a modification of this extremely
ingenious arrangement.--_Engineering_.

* * * * *

LINK BELTING.

[Footnote: From a paper read before the "Technischen Verein" of New
York, May 28, 1887.]

By CHAS. A. SCHIEREN.

The old saying that "there is nothing new under the sun" may well be
applied to leather link belting. It is generally believed that these
belts are of recent invention, but that is an error. They are over
thirty years old.

Mr. C.M. Roullier, of Paris, experimented that long ago with small
leather links one and one-half inches long by three-quarters of an inch
wide. These links had two small holes at equal distances apart, and were
joined with iron bolts, which were riveted at the ends, thus making a
perfectly flat surface, and in that way forming a belt entirely of
leather links.

Mr. Roullier's idea was to economize; he therefore utilized the material
left over from the manufacture of flat belting. He perfected his belt
and came to this country in 1862, when he patented the article here and
tried to introduce it. At first it produced quite a sensation, and many
tests were made, but it was soon found that Roullier's belts were not
suited to running our swift motion machinery, and they were therefore
abandoned as impracticable.

Mr. Roullier then introduced his invention into England, where he met
with some success, as his belt was better suited to English slow motion
machinery.

These belts are now largely used in England, many good improvements have
been made in them, and almost every belt maker in Great Britain
manufactures them.

Mr. Jabez Oldfield, of Glasgow, has the reputation of making the best
and most reliable link belt in Great Britain. He has also the reputation
of being the originator of these belts. This is, however, an error, the
credit of the invention belonging, as we have said, to Mr. Roullier.

Mr. Oldfield, nevertheless, has invented many useful machines for
cutting and assorting the links. He has also introduced improved meth