Show curious form farm of door 0 one 1 of tha oldest human Invent mar lona to the door on hinges at oae me ide able some borne weaving insects iB in sects sacia uch much as trapdoor spiders employ a in device dult but nothing enticing Is I 1 too old aid or I 1 tin good to weeps escape tile the efforts ot of fir loral ment meet A belgian J josiph ph henri heart da dierich irk invented al a door of if a new A w type con consisting of tuo too triangular delta which cluse close together oil it diagonal 11 hue rec running taing from am one 1 loner at comer er of dihe the door opening to the opp opposite upper opper corner mar th the two parts or leavea a a are pivoted wd sal in such inch a that when opening they ant g hate partitions par 1 in the calling leav leaving laig aa a entirely eni I 1 unobstructed |