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Acorn (RISC OS) Sprite  |  1996-07-19  |  307KB  |  640x480  |  8-bit (157 colors)
Labels: airplane | car | chair | clock | crt screen | door | earth | person | plant | pocketknife | road | sculpture | sky | stairs | stopper knot | time fuse | tree | wastepaper basket | windowpane
OCR: The balance- -spring, or hair- spring was introduced in 1675 by Christiaan Huygens It was used in clocks and watches which were controlled by balance wheels, and allowed them to keep much better time. The hair- TIME spring is still used in some watches today. MAP TOPIC The balance spring Is situated under the wheel. It Isa collwhich tightens when the watch punoM BAL ANCE HAIF SPRING OFF ON CD INFO NOTES BACK STORIES coll tlghtens wound BPRING