had been made on the most extensive scale, and in accordance with the latest improvements in the apparatus for submarine operations.
Buoys, made of huge canvas sacks, coated with India rubber, and guarded by a net work of strong cordage, had been manufactured and provided by the _New York Submarine Company_.

These buoys, when inflated and working in pairs, had a lifting capacity of 30 tons a pair.

Reservoirs of air, provided with powerful compression pumps, always accompanied the buoys.
To attach the latter, in a collapsed condition, with strong chains to the sides of the vessels which were to be lifted, a diving apparatus was necessary.

This also the _New York Company_ had provided, and it was so perfect in its way that, by means of peculiar appliances of easy management, the diver could walk about on the bottom, take his own bearings, ascend to the surface at pleasure, and open his helmet without assistance.

A few sets likewise of Rouquayrol and Denayrouze's famous submarine armor had been provided.