Show CANADA HAS BIG TELESCOPE reflecting apparatus at victoria la in said to be the largest yet constructed A seventy three inch reflecting telescope which ranks in size us as tho largest telescope of unit that type yet completed binti been constructed for tho the dominion astronomical observatory ut at victoria canada tho the instrument Is 1 described lit in popular mechanics the tha mirror which in III this thim typo of if tel takes the alio place of a lens in concentrating tho the rays of light ine measured meas aguren urea 73 indies inches in diameter over nil all la Is 12 inches inched thick at tin the edges adges and 1 Is pierced by it holo hole ten and one englith inches in diameter the slivered i upper surface Is it 11 parabola to bring the reflected light to a focus SO 30 feet above the mirror tills this enormous piece of flags weighs two anti one quarter tons and yet Is so nee accurately irately supported that no flex flexure tle suro uro lan can distort the surf itee which must nowhere deviate from the theoretical curve wore more than a 11 1000 of an inch tho the In instrument ent weighs US 55 tont tom find will reit red on massive alers of rn reen re en forced concrete co nereU alte tittle Is 31 11 ll fact long ind weighs 12 tons of titi usual interest from till nn engineering point of view tire are tho the donie dome and observing bridge tin the former la Is 36 feet in at diameter and Is provided with a double shutter having tin nil opening 15 feet wide all the movements including revolution to lo any desired position as well ns as tho the operation of if tho shut tir tor windshield an and the observing bridge afo nr 0 by menna of electric ino 1110 tors tora |