Machines that function day and night
Rely on pieces out of sight.
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Axles turning, most unseen,
Pins and spacers in between.
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Cogs and gears keeping pace,
Matching wheels in tight embrace.
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Pinioned arms that rise and fall.
Cranks and pivots, moving all.
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Working parts in constant play,
With squirts of oil along the way.
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Cranks and chains and lights that blink.
Moving parts that interlink.
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Various items stop and start,
Each playing its appointed part.
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So many kinds may be found,
Both with and without sound.
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A cylinder here, a sprocket there,
Clips and couplings everywhere.
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Belts and bearings, seals and springs.
Shafts and pulleys and cabled things.
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Clutches, drives, cams and keys.
Splines and brakes, yes, all of these.
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Machines that function night and day,
Such clever workings, you might say.