Oil Drop Tubes

Fun project.
Looking at how viscosity affects the drop of a ball in a fixed tube.

Made two tubes, one with Glycerine and one with light oil.

A Stirling Job

Bought a Stirling Engine Kit, and its gorgeous.
Otherwise known as an 'LTD' engine, (Low Temperature Differential Engine)
Bit fiddly to build, but possibly the best set of instructions I've ever had for any model!