The electromotive force so selected is balanced against the steady potential difference produced between a fixed and a sliding contact on a wire traversed by another steady current, and if there is any difference between this last, the potential difference, and the instantaneous potential difference balanced against it, a relay is operated and sets in action a motor which shifts the contact point along the potentiometer wire and so restores the balance.
The last section of this tube retains its connexion with the ventral portion of the somite, and so acquires an external opening, which is at first lateral, but soon shifts to the middle line, and fuses with its fellow, to form the single generative opening.
A man of action and not of cunning shifts, he succumbed on the 10th of July to the blows of his own government, which had passed from his hands into those of Robespierre, his ambitious and crafty rival.
The savings all expended and Sully fallen into disgrace, she lost her influence and became the almost unconscious instrument of an ambitious man of low birth, the Florentine Concini, who was to drag her down with him in his fall; petty shifts became thenceforward the order of the day.
Southern sky left blank of stellar emblazonments was necessarily centred on the pole; and since the pole shifts among the stars through the effects of precession by a known annual amount, the ascertainment of any former place for it virtually fixes the epoch.