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Lindenwold Castle, home of Richard Mattison. Lindenwold Castle, also known as the Mattison Estate, is the former personal estate in Ambler, Pennsylvania, United States of asbestos magnate Richard Van Zeelust Mattison (1851–1935) of the Keasbey and Mattison Company. [1] [2] [3] It was designed by Milton Bean [4] [5] and built in 1890. [2]
Donald Magnus Mattison (April 24, 1905 – July 28, 1975) was an American artist born in Beloit, Wisconsin. His father, Magnus Wilhelm Mattison, invented machine tools, and his mother, Florence May Knickerbocker Mattison, taught school. Mattison also had two sisters, Dorothy M. Spaugh and Ruth M. Eaton.
A grinding machine, often shortened to grinder, is any of various power tools or machine tools used for grinding. It is a type of material removal using an abrasive wheel as the cutting tool. [1] Each grain of abrasive on the wheel's surface cuts a small chip from the workpiece via shear deformation.
The first machine tools offered for sale (i.e., commercially available) were constructed by Matthew Murray in England around 1800. [11] Others, such as Henry Maudslay , James Nasmyth , and Joseph Whitworth , soon followed the path of expanding their entrepreneurship from manufactured end products and millwright work into the realm of building ...
The lower stone was completely perforated. The long handle rotated in a shallow socket in the upper surface of the upper stone. They are thought to have originated in Spain 2,500 years ago [22] [23] and appear to have arrived in maritime Scotland from about 200 BC with people who built the defensive homes known as brochs.
Pressed Steel Car strike of 1909: At least 12 people died when strikers battled with private security agents and Pennsylvania State Police mounted on horseback. [50] Eight men died on August 22, including 4 strikers. By the time the rioting was over, a dozen men were dead and more than 50 were wounded. March 9, 1910 – July 1, 1911
The tolerances that are normally achieved with surface grinding are ±2 × 10 −4 inches (5.1 μm) for grinding a flat material and ±3 × 10 −4 inches (7.6 μm) for a parallel surface. [4] The surface grinder is composed of an abrasive wheel, a workholding device known as a chuck, either electromagnetic or vacuum, and a reciprocating table.
A single-speed Dremel 'MultiPro' electric die grinder. Dremel ( / ˈ d r ɛ m ə l / DREM-əl ) is a multinational brand of power tools , focusing on home improvement and hobby applications. Dremel is known primarily for its rotary tools , such as the Dremel 3000, 4000 and 8200 series, which are similar to the pneumatic die grinders used in the ...