▁writers ▁Category : L iving ▁people ▁Category : 1 9 6 4 ▁birth s <0x0A> </s> ▁A ▁draft ing ▁machine ▁is ▁a ▁tool ▁used ▁in ▁technical ▁drawing , ▁consisting ▁of ▁a ▁pair ▁of ▁scales ▁mounted ▁to ▁form ▁a ▁right ▁angle ▁on ▁an ▁art ic ulated ▁prot ractor ▁head ▁that ▁allows ▁an ▁angular ▁rotation . ▁ ▁The ▁prot ractor ▁head ▁( two ▁scales ▁and ▁prot ractor ▁mechanism ) ▁is ▁able ▁to ▁move ▁freely ▁across ▁the ▁surface ▁of ▁the ▁drawing ▁board , ▁sl iding ▁on ▁two ▁gu ides ▁directly ▁or ▁indirect ly ▁anch ored ▁to ▁the ▁drawing ▁board . ▁These ▁gu ides , ▁which ▁act ▁separately , ▁ensure ▁the ▁movement ▁of ▁the ▁set ▁in ▁the ▁horizontal ▁or ▁vertical ▁direction ▁of ▁the ▁drawing ▁board , ▁and ▁can ▁be ▁locked ▁independently ▁of ▁each ▁other . ▁▁▁▁ ▁The ▁draft ing ▁machine ▁was ▁invent ed ▁by ▁Charles ▁H . ▁Little ▁in ▁ 1 9 0 1 ▁( U . S . ▁Pat ent ▁No . ▁ 1 , 0 8 1 , 7 5 8 ), ▁ ▁and ▁he ▁founded ▁the ▁Universal ▁D raft ing ▁Machine ▁Company ▁in ▁Cleveland , ▁Ohio , ▁to ▁manufact ure ▁and ▁sell ▁the ▁instrument . ▁ ▁D raft ing ▁machines ▁were ▁present ▁in ▁the ▁design ▁offices ▁of ▁European ▁companies ▁since ▁the ▁ 1 9 2 0 s . ▁ ▁The ▁Encyclop ædia ▁Britannica ▁explicitly ▁spec ifies ▁ 1 9 3 0 ▁as ▁the ▁year ▁this ▁tool ▁was ▁introduced , ▁but ▁an ▁advert is ement ▁of ▁" Mem orie ▁di ▁arch it ett ura ▁pr