▁spac ed ▁windows . ▁ ▁Building ▁ 1 6 ▁is ▁the ▁museum ▁office ▁and ▁former ▁co oper age . ▁ ▁Building ▁ 1 7 , ▁also ▁known ▁as ▁the ▁Men ' s ▁Bar ra cks , ▁stands ▁on ▁the ▁south ▁side ▁of ▁the ▁para de ▁ground ▁near ▁the ▁thro at ▁of ▁the ▁Dal h ous ie ▁Bast ion . ▁Two ▁stories ▁high ▁for ▁most ▁of ▁its ▁length , ▁the ▁rect angular ▁building ▁has ▁exterior ▁walls ▁of ▁stone ▁and ▁features ▁symmet rical ▁elev ations , ▁a ▁hi pped , ▁co pper ▁cl ad ▁roof , ▁and ▁a ▁project ing ▁course ▁of ▁stone ▁above ▁the ▁ground ▁floor . ▁ ▁Clear ly ▁seen ▁from ▁the ▁river ▁and ▁aligned ▁on ▁the ▁mer id ian ▁for ▁observation ▁purposes , ▁Building ▁ 2 0 , ▁also ▁known ▁as ▁the ▁Ball ▁House , ▁is ▁the ▁former ▁observ atory ▁and ▁time ▁ball ▁tower . ▁It ▁is ▁a ▁compact , ▁tall , ▁two ▁story ▁stone ▁structure ▁of ▁several ▁architect ural ▁shapes . ▁The ▁rect angular ▁section ▁with ▁a ▁g abled ▁roof ▁was ▁the ▁former ▁observ atory ▁and ▁the ▁square ▁section ▁formerly ▁hous ed ▁the ▁time ▁ball ▁installation ▁to pped ▁with ▁an ▁anten na . ▁The ▁building ▁is ▁entered ▁from ▁the ▁ground ▁floor ▁of ▁its ▁small ▁por ch , ▁which ▁joins ▁the ▁two ▁buildings . ▁ ▁Building ▁ 3 2 , ▁formerly ▁the ▁Def ensive ▁Guard ▁House , ▁is ▁located ▁at ▁the ▁eastern ▁end ▁of ▁the ▁north ▁main ▁d itch ▁below ▁the ▁King ' s ▁Bast ion . ▁It ▁is ▁a ▁small ,