Show 31 AN AM INGENIOUS instrument for tho accurate or ol coolies 11 I 1 t pa and popular Science news aws c alk ill attention lention nt to the he ingenious little instrument ili in the to irit ir it t cut t tin it of a 1 preno rr rii and for engineer dribin curves ure and tin the mine dairie accuracy wilh which cirt 1144 hru are with tile tb or Itry compass of which aich tire iho 14 1 4 only cony a n dimple ici tion A brovo it in the first enz engraving raving it atcon con sitson a pair of comp ilaM with one verli veri I 1 cal CAI arid annj oue one inclined teg log the ali lucinel ln cinel le P is ia to it bleeve b which vo 17 7 the abart r X JL 0 of the vel velt treat nal leg la 17 L c A mcdew lot lili lor 1 almli nde it lirely to alie L livirt when TiL cesary nn tina a 11 spring it arid wit inn 0 enable one to lu vary the di liui calic abe t f 0 o ICs rus as uny ulay IM i 1 I ca I 1 red in III tile the end of ottlie the vertical leg Is inserted it ii dry point f r nicil thu the inclined ica ir I 1 is F provided with it nicy 1 y suitable kill rich inch THE its as a pencil point pen fcc or crapon a pen for making dotted or arreg calir lines the two le lei isme con OD necked together bya by a thread IF F in operation the instrument is blell ty lie 9 at the lie top ly one hand h binl and the inclined leg ICK revolved vel around the vertical one vilh the other A As ai i it revokes revo liLs the thread is wound upon the dry point f 0 and alio llio distance lc be luteen teen the tio is con coa scantly stint ly find and tily linnal lied As it i consequence lie he marking kim point deschi lc a perfectly regular spiral sp iril the form of which ina mii lie varied by using different miss of ily points anti varying tire charac ter of the in liking point OD raum s DRAWN armi TUB THE to the second cut some home illustrations are n c gh ghchi ell of the capabilities of this himple but useful instrument which can easily be im provi profited ted from the contents of au an ordinary box of drawing |