The performers being grouped behind the scenes, their eyes fixed upon the stick of the electric metronome, are thus directly subject to the conductor, who could, were it needful, conduct, from the middle of the Opera orchestra in Paris, a piece of music performed at Versailles.
It is merely requisite to agree upon beforehand with the chorus-singers, or with their conductor (if as an additional precaution, they have one), the way in which the orchestral conductor beats the time--whether he marks all the principal beats, or, only the first of the bar--since the oscillations of the stick, moved by electricity, being always from right to left, indicate nothing precise in this respect.
When I first used, at Brussels, the valuable instrument I have just endeavored to describe, its action presented one objection. Each time that the copper key of my desk underwent the pressure of my left forefinger, it struck, underneath, another plate of copper, and, notwithstanding the delicacy of the contact, produced a little sharp noise, which, during the pauses of the orchestra, attracted the attention of the audience, to the detriment of the musical effect.
I pointed out the fault to Mr. Van Bruge, who substituted for the lower plate of copper the little cup filled with quicksilver, previously mentioned. Into this the protuberance so entered as to establish the electric current without causing the slightest noise.
Nothing remains now, as regards the use of this mechanism, but the crackling of the spark at the moment of its emission. This, however, is too slight to be heard by the public.
The metronome is not expensive to put up; it costs £16 at the most. Large lyric theatres, churches, and concert-rooms should long ago have been provided with one. Yet, save at the Brussels Theatre, it is nowhere to be found. This would appear incredible, were it not that the carelessness of the majority of directors of institutions where music forms a feature is well known; as are their instinctive aversion to whatever disturbs old-established customs, their indifference to the interests of art, their parsimony wherever an outlay for music is needed, and the utter ignorance of the principles of our art among those in whose hands rests the ordering of its destiny.