Photography Challenge #1: Photo 4 - Piston Macro

"A piston engine!" -- Mrs. Gorilla, Monty Python's Flying Circus

My Sterling Engine is, in fact, a piston engine. And small pistons make for fine macro photography subjects. Getting thing oriented so the lens can actually focus on the piston while it takes up a proper portion of the frame can be tricky, leading to reorienting the subject so the lens can get close enough without scratching the glass bits.

So, yes, the Sterling Engine was on its side for this photograph.