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British Standard Whitworth
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British Standard Whitworth is a screw thread standard that uses imperial units. It was devised and specified by British engineer Joseph Whitworth in 1841, making it the world's first national screw th
Two spanners, both nominal size 5⁄8 in, with a diagram superimposed to show the logic that allows them both to be nominal size 5⁄8 in when their actual sizes are clearly different (across-flats distance vs screw diameter). The across-flats definition is the common standard today, and has been for many decades. The larger spanner in this photo is from the 1920s or earlier. Its face was polished to allow the size stamp to show well in the photograph. This example is American, but it illustrates the way that spanners for Whitworth fasteners were typically labelled.
Two spanners, both nominal size 5⁄8 in, with a diagram superimposed to show the logic that allows them both to be nominal size 5⁄8 in when their actua
Joseph Whitworth
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Sir Joseph Whitworth, 1st Baronet was an English engineer, entrepreneur, inventor and philanthropist. In 1841, he devised the British Standard Whitworth system, which created an accepted standard for
British Standard Whitworth
…British Standard Whitworth (BSW) is a screw thread standard that uses imperial (inch-based) units. It was devised and specified by British engineer Joseph Whitworth in 1841, making it the world's first national screw thread standard. It became widely adopted across the United Kingdom and its former colonies…
Whitworth c. 1846
Whitworth c. 1846
The Firs, now the Chancellors Hotel & Conference Centre
The Firs, now the Chancellors Hotel & Conference Centre
12-pounder Whitworth rifle
12-pounder Whitworth rifle
Plaque from the memorial in Whitworth Park, Darley Dale erected in 1894
Plaque from the memorial in Whitworth Park, Darley Dale erected in 1894