Chemistry Apparatus Cartoons: The Side-Arm Test Tube

Continuing the series of chemistry apparatus humour, and developing the theme of tubes in particular, here is my latest cartoon:  the side-arm test tube.

This one occurred to me almost as soon as I'd finished work on the original test tube cartoon, which in turn came after the first idea, the beaker.  Next time - another tube in the chemistry equipment collection.

This is one of a short series of Chemistry cartoons, including The Test Tube, The Side-Arm Test Tube, The Delivery Tube, and The Measuring Cylinder.