2 brass plates with cogs in between. They are all connected and move together but one end moves more freely that the other. On the looser end, there is a metal device that moves a hand outside the plates. On the stiff end there is a cord connected…
Finely made divided windpipe - square section at base. Hopkins' fork is used with Chladni's plate to test whether pairs of vibrating zones are in-phase or out-of-phase.
Alcohol thermometer on wooden base with loops for handling. Calibrated in Fahrenheit from -50 to 125. Front and sides of base very dark brown. On top left ' 556 Cd ' stamped ' Univ. Abdn. Nat. Phil. '