of Louisville, as well as the licenses of S. F. Hayward and W. K. Platt.
This covers all the extinguisher patents in existence, except those of
Charles T. Holloway, of Baltimore.

The advantages of the chemical engine are well summed up in the
following statement:

The superiority of a chemical engine consists--

1st. In its simplicity. It dispenses with complex machinery, experienced
engineers, reservoirs, and steam. Carbonic acid gas is both the working
and extinguishing agent.

2d. In promptness. It is always ready. No steam to be raised, no fire to
be kindled, no hose to be laid, and no large company to be mustered. The
chemicals are kept in place, and the gas generated the instant wanted.
In half the cases the time thus saved is a building saved. Five minutes
at the right time are worth five hours a little later.

3d. In efficiency. Mere water inadequately applied feeds the fire, but
carbonic acid gas never. Bulk for bulk, it is forty times as effective
as water, the seventy gallons of the two smallest cylinders being equal
to twenty-eight hundred gallons of water. Besides, it uses the only
agent that will extinguish burning tar, oil, and other combustible
fluids and vapors. One cylinder can be recharged while the other is
working, thus keeping up a continuous stream.

4th. In convenience. Five or six men can draw it and manage it. Its
small dimensions require but small area, either for work or storage. One
hundred feet or more of its light, pliant hose can be carried on a man's