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- "E21","mouse trap side view","class 1 lever,"class 3 lever"
- "E22","???"
- "E23","tap","crank"
- "E25","vice/clamp close up","screw"
- "E26","microscope slide"
- "E27","microscope","rack and pinion"
- "E28 ","lathe bed","rack and pinion"
- "E29","lathe"
- "E30","pillar drill","rack and pinion"
- "E31","rotary hacksaw","oscillating motion"
- "E32","pillar drill platform","bevel gears"
- "E33","E32"
- "E34","mini digger on pavement","levers"
- "E35","wheel barrow handles held","class 2 lever"
- "E36","wheel barrow at rest"
- "E37","pendulum clock on wall","oscillating motion"
- "E38","weighing scales pan and weights in use","class 1 lever"
- "E39","microscope E26 E27"
- "E40","child's toy car","spur gear train"
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