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Basic line marking machines for turf were available by the late 1800s. [1]: 40 They were originally developed for use on lawn tennis courts.[1]: 40 One of the first such machines, a wheel-to-wheel paint transfer device, was developed by F.H. Ayres and "would be instantly recognizable by users of many of today's machines, which work on the same principle".
The term liquid chalk, or sharkchalk, refers to several different kinds of liquified chalk including liquid-chalk marking pens (with water-soluble ink), liquid-chalk mixtures (for athletic use: rock climbing, weightlifting, gymnastics), and liquid-chalk hobby-craft paints made of cornstarch and food coloring (some with small amounts of flour).
Equipment used for putting chalk lines on a cinder track. Billy Mills winning the 10,000 metres at the 1964 Summer Olympics, the last Olympics to be held on a cinder track. A cinder track is a type of race track, generally purposed for track and field or horse racing, whose surface is composed of cinders.
“In the Federal Government, the TAS field was optional for ~$4.7 Trillion in payments and was often left blank, making traceability almost impossible,” read an X post from DOGE.
Microsoft unveiled Majorana 1, a quantum chip the company says is powered by a new state of matter. The new chip allows for more stable, scalable, and simplified quantum computing, the company says.
A chalk line or chalk box is a tool for marking long, straight lines on relatively flat surfaces, much further than is practical by hand or with a straightedge. They may be used to lay out straight lines between two points, or vertical lines by using the weight of the line reel as a plumb line .
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