Riding the wave

Tilting Thermometer

Frame of a Magnaghi TILTING THERMOMETER to measure the water temperature at a chosen depth: the instrument is lowered to the desired depth by means of a cable connected to a winch; to stop changes in the reading during the ascent, a mechanical device causes the reversal so that the mercury column is broken, indicating the temperature at that depth.

Tilting thermometer
(Collection of the Hydrographic Institute of the Navy)
By Paola Presciuttini