How much does a social worker make? According to the May 2012 records from the Bureau of Labor Statistics, the mean annual healthcare social worker salary is $51,460, or $24.74 per hour. The lowest ten percent earn $31,410, while the top ten percent make an average of $74,030 annually.
The Leibniz Step Reckoner. Gottfried Leibnizâs 1673 âStep Reckonerâ introduced a design innovation that enabled a single gear to represent any digit from 0 to 9 in just one revolution. This stepped-drum approach dominated calculator design for the next two centuries. Gottfried Leibniz.
Emile Berliner (1851-1929) patented the gramophone. Early attempts to design a consumer sound or music playing gadget began in 1877 when Thomas Edison invented his tin-foil phonograph. The word phonograph was Edison's trade name for his device, which played recorded sounds from round cylinders.mile Berliner sold the licensing rights to his patent for the gramophone and method of making records to the Victor Talking Machine Company (RCA) who made the gramophone a successful product in the United States.