) ▁long , ▁with ▁a ▁bore ▁of ▁ 1 ▁met re ▁( 3 . 3   fe et ). ▁Origin ally ▁intended ▁to ▁be ▁susp ended ▁by ▁c ables ▁from ▁a ▁steel ▁framework , ▁it ▁would ▁have ▁been ▁over ▁ 1 0 0   met res ▁( 3 0 0   fe et ) ▁high ▁at ▁the ▁tip . ▁The ▁complete ▁device ▁we ighed ▁about ▁ 2 , 1 0 0 ▁t onnes ▁( the ▁bar rel ▁alone ▁we ighed ▁ 1 , 6 5 5 ▁tons ). ▁It ▁was ▁a ▁space ▁gun ▁intended ▁to ▁shoot ▁project iles ▁into ▁orbit , ▁a ▁theme ▁of ▁Bull ' s ▁work ▁since ▁Project ▁H AR P . ▁Ne ither ▁of ▁these ▁devices ▁could ▁be ▁elev ated ▁or ▁trained , ▁making ▁them ▁ ▁useless ▁for ▁direct ▁military ▁purposes , ▁unless ▁some ▁form ▁of ▁terminal ▁guidance ▁could ▁be ▁used ▁to ▁direct ▁the ▁fired ▁project ile ▁onto ▁its ▁intended ▁target . ▁ ▁It ▁is ▁possible ▁that ▁Big ▁Bab yl on ▁was ▁intended ▁both ▁to ▁launch ▁sat ell ites ▁and ▁to ▁serve ▁as ▁a ▁weapon , ▁but ▁its ▁ability ▁to ▁fire ▁conventional ▁project iles ▁in ▁the ▁latter ▁role ▁would ▁have ▁been ▁very ▁limited : ▁in ▁addition ▁to ▁the ▁impos s ibility ▁of ▁aim ing ▁it , ▁it ▁would ▁have ▁had ▁a ▁slow ▁rate ▁of ▁fire , ▁and ▁its ▁firing ▁would ▁have ▁produced ▁a ▁very ▁pron ounced ▁" sign ature " ▁which ▁would ▁have ▁revealed ▁its ▁location . ▁Since ▁it ▁was ▁imm obile , ▁it ▁suffered ▁from ▁the ▁same ▁vulner ability