Between July10 and July16 over sixty ballots were cast in the convention to determine what issue?

"Electors" chosen by the states according to state laws was the method agreed upon - after 60 ballots - for the selection of the President. At various times, the Convention approved and then rejected congressional appointment and election by state legislators. (This crafty compromise left each state free to determine how it would participate in the presidential selection process - and left to public pressure the task of assuring that in each state a public electoral process would be chosen.)

July, 1787