Here are a couple more recent technical illustrations (drawn for the good folks over at Decagon Devices, Inc.). The first is an illustration that shows proper sensor illustration techniques:
It contains a graph with what I think holds the record for longest graph title I've ever drawn: "Volumetric Water Content at Various Depths Over the Growing Season of Wheat Grown in a Palouse Silt Loam". Rolls right off the tongue, doesn't it? If I ever have a son, I think that's what I'll name him. He'll have a hard time with government forms. But no worse than his brother, Tiki Tiki Tembo No Sa Rembo Chari Bari Ruchi Pip Berry Pembo.