???µ??a????? epa?ast?se??

? ß??µ??a???? epa??stas? ?ta? µ?a pe???d?? e?s???????sµ?? p?? ?e????se ap? t? ??eta??a ?a? st? s????e?a e?ap?????e st?? ?p????p? ????p?. ?at? t? d????e?a a?t?? t?? pe???d??, p????? ???e? t?? d?t???? ??sµ?? µetat??p??a? ap? ?????? ?e??????? se pe??ss?te?? µ??a??p???µ??e?, ep?ta?????ta? t? d?µ???af??? a??pt??? ?a? p???a???ta? p??t?fa?e?? ??????µ???? a??a???. ??sa se µ???? 50 ?ept?, ?a µ??ete p?? a?t? ? epa??stas? d?aµ??f?se t?? ????p? ??a t??? ep?µe???? a???e? ?a? ?a ?ata???sete t?? ßa?? a?t??t?p? t?? st? s??????? ???????a. ??t? t? ap?? ?a? ?atat?p?st??? ß?ß??? pa???e? µ?a d?e??d??? s???t?s? ??a t?? s?µa?t???te?e? efe???se?? t?? ???µ??a????? ?pa??stas??, s?µpe???aµßa??µ???? t?? atµ?µ??a??? ?a? t?? µ??a??? es?te????? ?a?s??. ?e???aµß??e? ep?s?? µ?a p???? ß????af?a t?? ßas???? pa?a???t??, s?µpe???aµßa??µ???? t?? James Watt ?a? Thomas Edison, µ?a p???t?µ? e?sa???? st? ??????µ??? p?a?s?? ?a? µ?a a???????s? t?? a?t??t?p?? t?? ???µ??a????? ?pa??stas??, d????t?? sa? ??e? t?? ßas???? p????f???e? ??a a?t? t?? ???s?µ? pe???d? p?? d?aµ??f?se t? s??????? ???????a.