But，indeed，Mr。Martinhadbeforeusedthestrapofleather。
ThescrewofArchimedesisasancient，atleast，astheageofthatmathematician，whodiedmorethan2，000yearsago。DiodorusSiculusspeaksofit，L。i。，p。21，andL。v。，p。217，ofStevens’
editionof1559，folio；andVitruvius，xii。Thecuttingofitsspiralwormintosectionsforconveyingflourorgrain，seemstohavebeenaninventionofMr。Evans，andtobeafairsubjectofapatentright。ButitcannottakeawayfromotherstheuseofArchimedes’
screwwithitsperpetualspiral，foranypurposesofwhichitissusceptible。
Thehopper-boyisanusefulmachine，andsofarasIknow，original。