This phenomenon is connected with the fact that incandescent bodies, especially in rarefied gases, throw off or emit electrons or gaseous negative ions.
A remnant of the nation took refuge in an island of the Caspian (Siahcouye); others retired to the Caucasus; part emigrated to the district of Kasakhi in Georgia, and appear for the last time joining with Georgia in her successful effort to throw off the yoke of the Seljuk Turks (1089).
After it had vainly attempted to throw off the yoke by force of arms, it purchased its freedom in 1366; but, unable to reimburse the creditors who had advanced the money, it was, in 1368, obliged to recognize the supremacy of the house of Hapsburg.
Though their rule was favorable to the Romans, they were Arians; and religious differences, combined with the pride and jealousies of a nation accustomed to imperial honors, rendered the inhabitants of Italy eager to throw off their yoke.
But its subject-towns availed themselves of the political changes of the period to throw off their allegiance; Marathus from 278 begins to issue a coinage bearing the heads of the Ptolemies, and later on Karne asserted its independence in the same way; but in the end the Aradians recovered their supremacy.
At the commencement of the following reign his attainder was reversed and his brother Henry restored to the earldom; and Henry being appointed guardian to the young king Edward III., assisted him to throw off the yoke of Mortimer.
The first conspiracy was easily suppressed, and in 974 an attempt on the part of Harold III., king of the Danes, to throw off the German yoke was also successfully resisted; but an expedition against the Bohemians led by the king in person in 975 was a partial failure owing to the outbreak of further trouble in Bavaria.
They were still heathens, cherishing bitter hatred towards the Franks, whom they regarded as the enemies both of their liberties and of their religion; and their hatred found expression, not only in expeditions into Frankish territory, but in help willingly rendered to every German confederation which wished to throw off the Frankish yoke.
He was full of enthusiasm for liberty; the struggle of the Greeks to throw off the Turkish yoke enlisted his warmest sympathy, and at one time he seriously thought of entering the West Point Academy and fitting himself for a soldier's career.
The successful issue of the recent revolution of the English colonies in North America had filled the minds of some of the more educated youth of that province; and in imitation, a project to throw off the Portuguese yoke was formed, - a cavalry officer, Silva Xavier, nicknamed Tiradentes (tooth-drawer), being the chief conspirator.