Then they used a hydrometer to measure water density and an anemometer to determine the wind speed and direction.
(they; used; a hydrometer; to measure water density and an anemometer; T:Then) Context(they used,List([5, 14))):(they; used a hydrometer to measure; water density and an anemometer)
they used,List([5, 14))
they they
used used a hydrometer to measure
a hydrometer to measure water density and an anemometer T:Then
water density and an anemometer