Valentinian was restored in 388 by Theodosius, through whose influence he was converted to Orthodox Catholicism.
In electric cranes a useful method is to arrange the connexions so that the lifting motor acts as a dynamo, and, driven by the energy of the falling load, generates a current which is converted into heat by being passed through resistances.
By the action of dehydrating agents they are converted into aldehydes or ketones.
Hence it is not surprising that, in those more subtle forms in which energy cannot be readily or completely converted into work, the universality of the principle of energy, its conservation, as regards amount, should for a long while have escaped recognition after it had become familiar in pure dynamics.
The quantity of energy which, if entirely converted into heat, is capable of raising the temperature of the unit mass of water from C. to 1° C. is called the mechanical equivalent of heat.