Brass and wooden model of escapement with 60 second face. Pendulum ( ABDNP200022b ) fits on rear. Holes on right of base probably for small pulley wheel, now missing. Dial marked in seconds and labelled every 10 seconds. Escapement wheel 152 mm…
Demonstration of air resistance. Double windmill each with 4 vanes : first set vanes fixed perpendicular to direction of motion; second set of vanes can be rotated individually around axis of support arm to give range of resistance from…
This poster takes the form of an open letter to the editor of the Aberdeen Observer, and questions Mr Bannerman's credentials and ability to serve as MP.