taken from this year's annual report of the Office of Naval
Intelligence, which is an excellent authority, and to illustrate the
fact that of the thousands of accounts, which we see in foreign and
domestic newspapers, concerning the successful use of high explosives
in shells, fully ninety per cent. are totally unreliable. In many
cases they are in the nature of a prospectus from the inventors of
explosives or methods of firing, who are aware of the fact that it is
almost impossible to dispute any statements that they may choose to
make regarding the power of their new compounds, and thinking, as most
of them do, that power alone is required.

Referring to the qualities that I have previously cited as being
required in a high explosive for military purposes, it is sooner or
later found that nearly all the novelties proposed lack some of the
essentials and soon disappear from the advertising world only to be
succeeded by others. The most common defect is lack of keeping
qualities. They will either absorb moisture or will evaporate; or
further chemical action will go on among the constituents, making them
dangerously sensitive or completely inert, or they will separate
mechanically according to their specific gravities.

For further clearness on the subject of the shell charges which have
so far been discussed, the following table is added of weight and
sizes of shells for United States naval guns, with their bursting
charges of powder:

6-inch com. cast steel shell 31/2 to 4 cal. long, wt. 100 lb., charge 6 lb.
8 " " " " " 250 " 141/2 lb.
10 " " " " " 500 " 27 "
12 " " " " " 850 " 45 "