English to Persian (Farsi) Other General / Conversation / Greetings / Letters Church

How'd you translate "counterweights"?



Actually, he developed a clever mechanical arrangement beneath the altar
placed in front of the giant temple door. When the priest would step forward
and light the fire on the altar, the heat generated would kick the counterweights
and pulley arrangement beneath it into action, which would subsequently open
the door. Such an arrangement in those times was seen as a miracle.