The inclosed sketch will explain
itself:
[Illustration]
A is a cutter, and B a collar, screwed upon the cutter bar, C. The edge
of this collar fits into a notch on either end of the cutter, as shown
at D, thus leaving the cutter as strong as possible at the center, and
giving it a solid support at the point where support is needed, and at
the same time insuring its always coming alike.
Brooklyn, N.Y.
THEODORE L. WEBSTER.
[The device seems to be eminently well calculated for the support of the
cutter on a boring bar, and is applicable, with but slight modification,
to a pin or "teat" drill. Machinists will readily perceive its operation
and excellencies.--EDS.
* * * * *
Tides and Their Causes.
The phenomenon of the daily tides of our seacoasts and tidal rivers is
attributed to the attraction of the moon upon the earth--that the moon
draws the earth towards it, and that in drawing the earth towards it, it
bulges up the water of the ocean on the side presented towards the moon,
and drawing the earth and water thus on that side, also draws the earth
_away_ from the water on the opposite side of it, and thus leaves the
water bulged up on _that_ side, and in doing all this the effect comes
after the cause some three hours, which is termed "the tide lagging
behind.
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