CURIOUS EXPERIMENTS
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From some experiments on the adhesion
of glue instituted by Mr.. Bevan. and an ac-
count Of which he has inserted IN the last
number of the Philosophical Magazine, It
appears that force Of ! $50 lbs applied at
right angles to the surface in contact. was
required to separate two cs slinders OF dry
asl-wood OF u inches in diameter, and a
bout inches long, after they had been
glued together q hours. The pressure


was applied gradually, and was sustained


two or three hours before the separation took


place. The force Of rs los. would, there


fore, bcrequired to separate one square insh.
The force required to separate dry Scotch
fir-wood 46a lbs: 60 the square inch; SO that
if two pieces Of this wood had been well
glued together, the wood would have yielded
in its substance before the glue The CO.
hesion of solid glue WAS 1000 lbs. TO the


square inch: from this it may be inferred


that the application of this substance as a


cement is susceptible OF Improvement.


Monthly Magazine.