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A mechanical engineer whose work connected gas lighting to automatic operation. Chalmers records his mechanical-engineering qualification in 1896.^[ref] After an accident left him blind in 1912, he returned to AGA in 1913 and continued leading the company.^[ref]

The sun valve links radiometric absorptance, thermal expansion and mechanical motion to a useful decision: whether a beacon should receive its main gas supply. The Dalén light combines this daylight response with repeated flashes. The Nobel Prize in Physics in 1912 recognized his automatic regulators for lighthouse and buoy lighting.

A mechanical engineer and emeritus professor whose research concerns boundary layer separation and fluid mechanics.^[ref]

A mechanical engineer applies mechanical engineering to components and systems involving motion, loads or energy conversion. The work can include modeling stresses and vibration, sizing thermal systems and specifying tolerances or manufacturing processes. A rotating shaft, for example, requires reasoning about torque, deflection, fatigue and bearing support together. The resulting design depends on load histories and material properties as well as the geometry of the part.