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2. Etch A Sketch - Wikipedia

   en.wikipedia.org/wiki/Etch_A_Sketch

   Pulley 1 (single-groove) connects to pulley 2 (triple-groove) via a short infinite reciprocating cable. Pulley 2 connects to 3 (double-groove) via a longer reciprocating cable attached along its upper course to one end of the vertical rail (6), and then a third cable runs from 2 to 3, 4, and 5 (4 and 5 are single-groove) via another much longer ...

3. Tinkertoy - Wikipedia

   en.wikipedia.org/wiki/Tinkertoy

   Spools and pulleys all have a single groove around the outside; "Part W" has two parallel grooves. Sticks (or "rods") are slotted on each end, both to provide slight flexibility when inserted into snug-fitting holes, and to allow thin cards, flags, and strings to be inserted into the slots.

4. Multisided record - Wikipedia

   en.wikipedia.org/wiki/Multisided_record

   A multisided record is a type of vinyl record that has more than one groove per side. This technique allows hidden tracks to be encoded on LPs, 45 rpms and 78 rpms. On a disc that has a multi-groove, whether the listener plays the main track or the hidden track depends on where the stylus is cued.

5. Pulley - Wikipedia

   en.wikipedia.org/wiki/Pulley

   A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain. The earliest evidence of pulleys dates back to Ancient Egypt in the Twelfth Dynasty (1991–1802 BC) [1] and Mesopotamia in the early 2nd millennium BC. [2]

6. Unusual types of gramophone records - Wikipedia

   en.wikipedia.org/wiki/Unusual_types_of...

   Disturbed Immortalized (LP) Side 4 is Decorated with etching on whole side. The Double Vinyl release of Matt Costa's album Unfamiliar Faces has etched artwork on Side D. The 2008 album Unfamiliar Faces by Matt Costa has a Double Vinyl release but it had music only on three sides, Side A, Side B and Side C featured all the tracks from the CD ...

7. Belt (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Belt_(mechanical)

   Round belts are a circular cross section belt designed to run in a pulley with a 60 degree V-groove. Round grooves are only suitable for idler pulleys that guide the belt, or when (soft) O-ring type belts are used. The V-groove transmits torque through a wedging action, thus increasing friction.