Officer cadets under instruction from a Second Officer in a classroom on board the Federal Steam Navigation Company cargo liner Otaio (1958). The officer is setting up an experiment on the end of a bench. It comprises a clamp stand with a glass bottle held between two long glass tubes. The clock on the wall is reading 12.11 and display cases along the wall contain various type of gauges and meters. Transparencies P64401CT and P64402CT were taken on the same occasion.