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Left-handed screw


  • Webster's Revised Unabridged Dictionary
    • Left-handed screw a screw constructed to advance away from the observer, when turned, as in a nut, with a left-handed rotation. An ordinary wood screw is right-handed.
    • ***


In literature:

He was stooping forward, with his right hand at the screw-brake between his legs, and in his left hand he swung his heavy whip.
"Tomaso's Fortune and Other Stories" by Henry Seton Merriman
Then the two are held firmly together with the left hand until the cap screw is turned tight.
"Handwork in Wood" by William Noyes
Contact is thus made between the upper binding screw and the left-hand screw.
"Electric Bells and All About Them" by S. R. Bottone
On one end also a right-handed, and on the other a left-handed, screw-thread is turned.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various
Note that the screw in the three-bladed instrument is a left-handed one.
"Surgical Instruments in Greek and Roman Times" by John Stewart Milne
Left handed screw Vis a filet gauche.
"English-French and French-English dictionary of the motor car, cycle, and boat" by Frederick Lucas

In news:

If the DNA double helix were a screw, it would be right-hand ed, too, and many other organic molecules have folds or twists that can be described as either left- or right-hand ed.
Easy four-screw installation and left or right hand mounting capabilities are featured.

In science:

In our opinion, there is no reason not to require that under conformal transformations the left-handed and right-handed fermions transform in different ways! We can easily visualize this situation by the example of two different kinds of screws.
Pure Spinor Formalism for Conformal Fermion and Conserved Currents
When we screw both, the clockwise (right-handed) and counterclockwise(left-handed) screws, in the same rotation direction, we can observe that if the former is screwed (translated) in, the latter will be screwed (translated) out.
Pure Spinor Formalism for Conformal Fermion and Conserved Currents