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The lumen (lm) is the SI unit for luminous flux, the total amount of light emitted by a source, weighted according to the sensitivity of the human eye to various colours of light. Lumens per watt is a common measure of the efficacy of a light source. The luminous flux is of less value for bicycle lighting due to the importance of directionality.
The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...
Around 1922, Blackburne first ran the Tomtit two-cylinder light aircraft engine based on the Lympne 696 cc V-twin. Blackburne Thrush. In 1924 the company produced the Blackburne Thrush a three-cylinder light aircraft engine. The first engine design was of 1098 cc, consistent with the capacity limit imposed for the 1924 light aeroplane trials at ...
Shimano, Inc. (株式会社シマノ, Kabushiki-gaisha Shimano), originally Shimano Iron Works (島野鐵工所) and later Shimano Industries, Inc. (島野工業株式会社), is a Japanese multinational manufacturing company for cycling components, fishing tackle and rowing equipment, which also produced golf supplies until 2005 and snowboarding gear until 2008.
These "ROTOR System" cranksets fit into classic BSA and ITA bicycle frames. Unlike a standard pair of cranks that always remain at 180 degrees relative to each other, the ROTOR system varies this angle through the circle of motion. The left and right crank arms speed up and slow down independently, relative to the chainrings during the ...
His second machine, [1] the Second Monoplane was very different, and resembled Léon Levavasseur's Antoinette design which Blackburn had seen in France. The monoplane wing was rectangular with a constant chord , significant dihedral and square tips, and had a thin aerofoil section cambered on the underside, as was usual at the time.
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