Lecture 2. In situ Measurements (2). Monday, 1100‐1230 A brief review of the instrument concepts introduced in the first lecture will be followed by a discussion of some new and novel platforms for the measurement of underwater optics. Emphasis will be on autonomous measurement systems: moored platforms, autonomous underwater and surface vehicles, gliders, surface drifters, profiling floats, and animal tags. The lecture will finish with a discussion of two ancient optical measurement devices, and the surprising utility of these for solving modern problems in biological oceanography. Bibliography Ocean Optics Web Book. http://www.oceanopticsbook.info/view/introduction/overview