Show rn or it is ir a remar able fact that one odthe oatlie in ennst t abundant materials in in nature iron is ia the strongest of all known substances made into the th bent steel etcel a rod one fourth of if in an inch in dia diameter moter will susin attain 13 pounds b fore breaking soft ft it fl pounds pound iron r e pound pou id I bar ar iron 4 pound poi ird ine inferior bior har bar iron 3 pounds cat ca tiron iron 1000 t to pound i copper wire win 3 poune milver 2000 3 tin cast zine zinc sheet zinc 1 cast lead 55 milled lead lead 20 KJ P J of woods cods box to and locust abi same siz if will hold I 1 1200 I 1 potin ap all the vit rat asti am kwech coar cear white bitte oak i pich pine pille COO pounds chestle jirld soft mople popl ar 1 0 0 wood which will bear a t ve very 1 y heary w ight lor for a ein m iri t ftp or oj two will break brcik with two odilie of tho force acting artin ar tin faa time A rod of iron iq ii aboud 1 etim c s as s strong as a bo cord A rope of an in ill diar heter 1 I 11 ill ll br bear two and a liala tons but blit in in practice pi notice it is ie not best to subject it to a strain of more than oto oric tou ton half in an inch in diameter the strength will lie be one quarter as ai it quarter of an inch one sixteenth aix tient ent i and in a so on |