96. Between the earth and a thundercloud there are four currents of
air, having a temperature of 87, 57, 47, and 37 degrees respectively.
The first current is half the depth of the second, the second half
the third, and the third half the fourth. If a peal of thunder is
heard 2-3251/4256 seconds after the lightning flash, find the depth
of the fourth current and the time occupied by the sound in passing
through it.
97.
First cut out, with a pen-knife, in paste-board or card,
The designs numbered 1, 2 and 3,
Four of each; after which, as the puzzle is hard,
You had better be guided by me
To a certain extent; for, in fixing, take care
That each portion is fitted in tight,
Or they will not produce such a neat little square
As they otherwise would if done right.
[Illustration]