▁equivalent ▁to ▁our ▁modern ▁B . A . ▁At ▁Harvard , ▁Br attle ▁developed ▁marked ▁skill ▁in ▁mathematics ▁and ▁science . ▁Though ▁he ▁is ▁most ▁well ▁known ▁for ▁The ▁W itch craft ▁Del usion , ▁which ▁was ▁written ▁to ▁argue ▁against ▁the ▁S alem ▁W itch ▁Tri als , ▁Br attle ▁was ▁interested ▁in ▁many ▁areas ▁including ▁mathematics , ▁architecture , ▁and ▁astronom y . ▁ ▁Br attle ▁gained ▁most ▁of ▁his ▁education ▁on ▁his ▁own ▁due ▁to ▁the ▁bad ▁leadership ▁at ▁Harvard ▁in ▁his ▁under grad uate ▁years . ▁He ▁used ▁whatever ▁books ▁that ▁were ▁available ▁and ▁studied ▁with ▁John ▁F oster ▁and ▁Dr . ▁William ▁A very . ▁Br attle ▁wrote ▁a ▁letter ▁to ▁John ▁Fl am ste ed , ▁a ▁ment or ▁of ▁his , ▁stating ▁that ▁no ▁one ▁at ▁Harvard ▁could ▁teach ▁him ▁mathematics ▁so ▁he ▁took ▁it ▁upon ▁himself ▁to ▁do ▁so . ▁Thomas ▁and ▁a ▁group ▁of ▁other ▁prominent ▁colon ists ▁studied ▁several ▁com ets ▁that ▁appeared ▁in ▁the ▁late ▁sevent e enth ▁century . ▁He ▁wrote ▁several ▁ess ays ▁on ▁these ▁com ets . ▁ ▁Br attle ▁later ▁travel led ▁abroad ▁and ▁then ▁settled ▁in ▁Boston ▁in ▁ 1 6 9 3 , ▁where ▁he ▁purs ued ▁a ▁short ▁business ▁career ▁and ▁gave ▁several ▁g ifts ▁to ▁Harvard . ▁That ▁same ▁year , ▁he ▁was ▁appointed ▁as ▁the ▁Harvard ▁College ▁tre as urer ▁and ▁he ▁served ▁in ▁that ▁position ▁for ▁twenty ▁years ▁until ▁his ▁death . ▁During ▁his ▁time ▁as ▁tre as urer , ▁the ▁fin