East german inventions

The Praktica L series of SLR cameras was produced from 1969 to 1989, an amazing period of 20 years. It is said that an L was rolled of the Dresden production line every 30 seconds, and these cameras are therefore still fairly easy to find on ebay and in the flea markets and bazaars of eastern Europe. After using a Diana, the “rapid wind lever” seems like an amazing invention. Being an SLR , the L has a mirror that beams exactly what the lens is seeing into a catoptric chamber on the top of the camera, showing precisely what each shot will look like when you press down on the shutter release through the Praktica’s rectangular view-finder.

Yet a student of the Chinese technology of the early twentieth century remarks that even a generation ago the Chinese had not 'reached that stage where continuous rotary motion is substituted for reciprocating motion in technical contrivances such as the drill, lathe, saw, etc. To take this step familiarity with the crank is necessary. The crank in its simple rudimentary form we find in the [modern] Chinese windlass, which use of the device, however, has apparently not given the impulse to change reciprocating into circular motion in other contrivances'. In China the crank was known, but remained dormant for at least nineteen centuries, its explosive potential for applied mechanics being unrecognized and unexploited.

Newton was elected to a fellowship in Trinity College in 1667, after the university reopened. Two years later, Isaac Barrow , Lucasian professor of mathematics, who had transmitted Newton’s De Analysi to John Collins in London , resigned the chair to devote himself to divinity and recommended Newton to succeed him. The professorship exempted Newton from the necessity of tutoring but imposed the duty of delivering an annual course of lectures. He chose the work he had done in optics as the initial topic; during the following three years (1670–72), his lectures developed the essay “Of Colours” into a form which was later revised to become Book One of his Opticks .

This elitist inclination widened the divide between feminist organizers and the masses of American women who lived in those slums or spoke with foreign accents. As a result, working-class women—already more concerned with wages, hours, and protective legislation than with either the vote or issues such as women’s property rights—threw themselves into the trade union movement rather than the feminists’ ranks. Anthony, however, ceded no ground. In the 1890s she asked for labour’s support for woman suffrage but insisted that she and her movement would do nothing about the demands made by working women until her own battle had been won. Similarly, when asked to support the fight against Jim Crow segregation on the nation’s railroads, she refused.

East german inventions

east german inventions

This elitist inclination widened the divide between feminist organizers and the masses of American women who lived in those slums or spoke with foreign accents. As a result, working-class women—already more concerned with wages, hours, and protective legislation than with either the vote or issues such as women’s property rights—threw themselves into the trade union movement rather than the feminists’ ranks. Anthony, however, ceded no ground. In the 1890s she asked for labour’s support for woman suffrage but insisted that she and her movement would do nothing about the demands made by working women until her own battle had been won. Similarly, when asked to support the fight against Jim Crow segregation on the nation’s railroads, she refused.

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