tom swift among the diamond makers

 Now what is an ideal well back then an ideal was kid of like a duel between churches and the way it worked usually was you lit a fire or something and you had to walk by it in a way so there is one hundred percent no way you arent burned extremely badly in this case it was to fires with a little path in between the two fires. what is was for is that it more or less forced God to make a miracle but he never did because that is how you won the ideal is you by the fire without being burned and that showed God was on your side.