| OCR Text |
Show Your Eye Can See One OneMillionth OneMillionth l\IilIionth l IilIionth Millionth lIilIionthof Millionthof \ ofan of an InchWASHINGTON Inch InchWASHINGTON WASHINGTONThe WASHINGTON -The The - The ne.t net neat neattime ne.ttime nexttime } . time you see a film ofoil of oil 011 on a arain arain arain ' rain puddle in the pavement pavementlook pavementlook look for the colored light lightfringes lightfringes lightfringes fringes . Pretty . Yes But , more impor impor- important important . - tant , they indicate that your eye eyecan eyecan eyecan can detect a difference dlfrerence of one- one onem1l11Onth onemillionth one-millionth one millionth - m1l11Onth millionth of an inch That is the thethickness thethickness ' thickness of the oil 011 films which pro pro- produce produce produce - duce those colors by interferenceThe interference interferenceThe interferenceThe The beautiful coloring of some but but- butterfly butterfly butterfly - terfly wings wmgs is a similar phenome phenome- phenomenon phenomenon phenomenon - non of thin thm than flims tUrns alms . The best microm mIcrom- mIcrometer micrometer micrometer - eter gauges now stow in use will wlU detect detectdIfferences detectdifferences detectdifferences dIfferences of only one ten thou thousandth thousandth thoueandlh sandth of an inch . |
