|
25 | 57.82 | 64.67 | |
26 | 60.14 | 66.99 | |
27 | 62.45 | 69.30 | |
28 | 64.76 | 71.61 | |
29 | 67.08 | 73.93 | |
30 | 69.39 | 76.24 | |
31 | 71.70 | 78.55 | |
32 | 74.01 | 80.86 | |
33 | 76.33 | 83.18 | |
34 | 78.64 | 85.49 | |
35 | 80.95 | 87.80 | |
36 | 83.27 | 90.12 | |
37 | 85.58 | 92.43 | |
38 | 87.89 | 94.74 | |
39 | 90.20 | 97.05 | |
40 | 92.52 | 99.37 | |
41 | 94.83 |101.68 | |
42 | 97.14 |103.99 | |
43 | 99.46 |106.31 | |
44 |101.77 |108.62 | |
45 |104.08 |110.93 | |
46 |106.39 |113.24 | |
__________|___________|_____________|______________|

34
NOTE.--Equivalent depth in feet = ------ x pressure.
14.7

E.P. GOODRICH, M. AM. SOC. C. E. (by letter).--This paper is to
be characterized by superlatives. Parts of it are believed to be
exceptionally good, while other parts are considered equally dangerous.
The author's experimental work is extremely interesting, and the writer
believes the results obtained to be of great value; but the analytical
work, both mathematical and logical, is emphatically questioned.

The writer believes that, in the design of permanent structures,
consideration of arch action should not be included, at least, not until
much more information has been obtained. He also believes that the
design of temporary structures with this inclusion is actually dangerous
in some instances, and takes the liberty of citing the following
statement by the author, with regard to his first experiment:

"About an hour after the superimposed load had been removed, the
writer jostled the box with his foot sufficiently to dislodge some
of the exposed sand, when the arch at once collapsed and the bottom
fell to the ground."

The writer emphatically qu