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Harriet Tubman was one of the most energetic of these slave conductors and brought away several thousand slaves. William Lambert, a colored man, was reputed between 1829 and 1862 to have aided in the escape of thirty thousand. The decade 1840-50 was a period of hope and uplift for the Negro group, with clear evidences of distinct self-assertion and advance.

In the Northwest the public school lands were wasted by thoughtless or venal politicians, and in the older South the label, "school for the children of the poor," went far to defeat all efforts made by legislatures on behalf of good public school systems. In the period of 1840-50 Horace Mann revived the New England interest in education and laid the foundations for the school systems of to-day.

This was followed by a long harmonic bar extending above the whole length of the wrest-plank, which it defends from any tendency to rise, by downward pressure obtained by screws. During 1840-50, as many as five and even six tension bars were used in grand pianofortes, to meet the ever increasing strain of thicker stringing.

In the language of the time the Farmers were Socialists, but the Socialism of 1840-50 was a very different proposition from the Socialism of to-day. The earlier socialists were not in politics. They had no party, politically speaking, and took only a remote and indirect interest in political affairs. What they wanted was to reform the world; to reconstruct civilization on a scientific basis.

The area of the United States seemed limitless, and hardly a tenth of its arable land had ever been brought under cultivation. The inventions of 1840-50 enabled the Western farmer to grow larger crops, and harvest time was not so burdensome; corn-shellers and grain-fans shortened the hours of labor for the men.

Turning to a consideration from a similar point of view of Ericsson's services in connection with warship design and construction, note may be first taken of the condition of the art of naval warfare in the years 1840-50, or when Ericsson first began his labors in this field.