Ball bearings {ball bearing}| use several or many spheres rotating in oil in an annular sleeve.
bell striker, or hanging part {clapper}.
cylindrical rod {dowel}.
Soft materials {gasket}| can squeeze between two hard pieces, to prevent fluid leaks.
Metal or plastic eyelets {grommet}| can be in cloth or leather.
Flagpole hooks {halyard}| can hold flag eyelets.
Vertical supports {kingbolt}| can be in centers of roof trusses.
hammer wedge-shaped or round side {peen}.
plaited straw strip {plat, strip}.
plow blade {plowshare, blade}.
Silver, copper, or brass can oxidize {tarnish} in air. Oxidizing is faster if food acid or moisture is present.
Chemicals {polish}| {silver polish} {brass polish} {copper polish} can clean tarnish. Furniture polish or plastic spray prevents tarnish.
Chemical or abrasive can remove tarnish. Abrasives include clay, diatomaceous earth, or chalk, which mix in water or another solvent. Polishing cloths can use powdered iron oxide {jeweler's rouge} as abrasive.
Brass and copper tarnish can rub off with acetone. Dip cleaners use chemicals to remove oxides but can dull the finish.
Aluminum pot filled with hot water and detergent can clean objects {electrolytic cleaning}. Tarnish transfers to pot.
surrounding cylinder {sleeve}|.
Roller or flat pieces {tappet} pushed by camshafts can transfer motion to valves.
three-ply twine {packthread}|.
String {twine}| can have more than one thread.
sharp edge {bevel, edge}|.
Slanted edge {bezel} can be for cutting.
To hold piece to another piece, a pin {cotter pin}|, split at end, goes through aligned holes, and then a tool bends ends outward.
Metal fasteners {hasp} can be over staples.
Pins {linchpin}| through axle-outside holes can prevent wheels from sliding off.
Spindles or axles {mandrel} {mandril} can hold metal to machine.
Small cylinders {rivet}, with flange on one side, can go through aligned holes of two metal sheets, and pulling one side and hammering the other holds the sheets together.
Pins {wrist pin}| can join piston and connecting rod.
Suspension bearings {bushing}| allow small rotations.
In bearings {journal bearing}|, shafts can turn in oil-filled sleeves, like axles in sockets.
Wheels can turn around axles using chambers with small lubricated spheres between them {roller bearing}|.
Rotating rollers {gear}| with notches {teeth, gear} can mesh with other gears.
gear tooth {cog}|.
Driven toothed wheels {cogwheel}| can change speed or direction of second toothed wheels.
Pinions can engage larger gears {rack}|.
Gears can first rotate at same speed as another gear already turning {synchromesh}|, to allow optimum meshing.
Slanted gears {bevel gear}| can change rotation direction, using straight, spiral, or hypoid teeth.
Smaller gears {pinion}| can engage racks.
Spherical outer gears can engage a central gear in epicyclic gears {planetary}|, as in transmissions.
Gears {rack and pinion gear} can have two cylinders that meet at right angles.
Gears {recirculating ball gear} can be spheres.
Gears {spur gear}| can attach to differentials to mediate axle gears.
Gears can be wheels {wheel gear}.
Gears can have a helix around a cylinder {worm, gear} that turns a wheel {worm wheel} that engages a groove.
Ropes can have knots {rope, knot}.
Deformations cannot make circles from loops {knot, rope}| {Alexander polynomial} {HOMFLY polynomial} {Jones polynomial} {Kauffman polynomial}.
Knots {love knot} can be like ribbon bows.
Three rings {Borromean rings} can overlap, so that no pair of rings has a link but just overlaps, but the three rings cannot separate because each third ring passes through overlapped region of the other two.
A ring can pass through another ring so the rings cannot separate {link}.
Twist one ring to make loop and pass ring through loop {trefoil knot}.
Twist one ring to make two loops and pass other ring through the loops so the rings cannot separate {Whitehead link}. The rings have no net linking.
Knots {bend} can join two ropes at their ends.
Rope part {bight}| can have knot.
To connect two loops or a loop and ring, put loop through ring or loop and then put other loop end, with object, through loop and pull {cinch knot} {clinch knot} {blood knot}.
To attach object to post, loop rope around post, pass under rope, and loop higher than rope {clove hitch}.
To join ends of two ropes so they untie easily, place right-rope end over left rope and pass around and up, pass left-rope end over right rope above place where first loop is, and pass around and out to left {granny knot}.
To link rope and post or loop, pass rope around post or loop, come back to original side, pass around rope, put rope inside loop, and pull {half hitch}.
To shorten rope, tie loop in the bight {sheepshank}.
Knots {sheet bend} can join ropes to middles of other ropes.
To slide loop along rope, make loop, put end around rope, pass to loop inside, pass over small loop, and pass through to make knot {slipknot}.
To permanently join ends of two similar ropes, unravel rope threads and intertwine them {splice}.
To join ends of two similar-size ropes, place right-rope end over left rope and pass around and up, pass that end over left rope above place where first loop is, and pass around and out to right {square knot}.
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Description of Outline of Knowledge Database
Date Modified: 2022.0225