One who had seen him, as I did, stand uncovered in the presence of his new Washington hand-press, the day that dynamo of Light was erected in the Argus office, could never suppose him to lack humanity or the just reverence demanded by his craft.

Although the disc dynamo in its original form was impracticable as a commercial machine, yet it was not only the forerunner of the dynamo, but was, in point of fact, the first machine ever produced that is entitled to be called a dynamo.

I may say here that surrounding the armature of a dynamo by the field coils, though very recently put forth as a new departure, was described in various Thomson-Houston patents, and to a certain extent all Thomson-Houston machines embody this feature.

In the engine room there are six enginesone for driving the boat, two for compressing the air for the torpedoes, an engine for working the dynamo for producing the electric light, an engine for forcing air into the stoke-hole, and an engine working in conjunction with the distilling apparatus for supplying drinking water for the crew and the waste incidental to the boiler.

The shock of the explosion had evidently thrown the dynamo out of gear.