As you hold the vibrating tuning fork over the open end of the tube, find the position where resonance produces the loudest sound by moving the glass tube slowly up and down in the water of the cylinder.
(you; hold; the vibrating tuning fork over the open end of the tube) (resonance; produces; the loudest sound; L:the position)
you resonance
hold produces
the vibrating tuning fork over the open end of the tube
the loudest sound L:the position