model. The carriage may be driven at any assigned speed by adjusting
the governor of the driving engine already alluded to, but the record
of the speed by means of the time and distance diagrams is more
definite. When the resistances of the model have been obtained at
several speeds, varying in some cases from 50 to 1,000 feet per
minute, the speeds are set off in suitable units along a base line,
and for every speed at which resistance is measured, the resistance is
set off to scale as an ordinate value at those speeds. A line passing
through these spots forms the "curve of resistance," from which the
resistance experienced by the model at the given trial speeds or any
intermediate speed can be ascertained. The resistance being known, the
power required to overcome resistance and drive the actual ship at any
given speed is easily deduced by applying the rule before described as
the law of comparison.--_The Steamship._

* * * * *




THE SHIP IN THE NEW FRENCH BALLET OF THE "TEMPEST."


A new ballet, entitled the "Tempest," by Messrs. Barbier and Thomas,
has recently been put upon the stage of the Opera at Paris with superb
settings. One of the most important of the several tableaux exhibited
is the last one of the third act, in which appears a vessel of unusual
dimensions for the stage, and which leaves far behind it the
celebrated ships of the "Corsaire" and "L'Africaine." This vessel,
starting from the back of the stage, advances majestically, describes