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ACROSS
1)  a term used in scottish names of promontories
2)  united states chemist who discovered deuterium (1893-1981)
3)  a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
4)  strongbox where valuables can be ____ly kept


DOWN
1)  the quantity that can be held in a mug
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  the main organ of photosynthesis and transpiration in higher plants
4)  a harp used by ancient greeks for accompaniment

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