Labels:book | box | clock | earth | hakham | person | pole | poster | press | road | sky OCR: INDUSTRY Leonardo designed many ingen lious mechanisms that are essential com iponents WORM GEAR of 'modern-day machinery and planned write book on the subj ject. His work comes 400 years before the first known systematic study of machine elements the 19th century. orm' is another word for the thread of a screw This device combines screw with a gear As the gear turns heavy wei ight can be pulled up by turning crank When usinga pulley ifyou let go the weight falls down again. With worm gear, you can let go and the weight will stay suspended at clock the continue same maker pulling height Henry up You the Hindley can load. rest The and reinvented English then the INDUSTRY worm gear in the 18th century "Dealing with heavy weights op not commit yourself to iron teeth, because one of the teeth ...
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