Here is a gallery of some of the diagrams I worked on for Wikimedia. H Padleckas
U-tube heat exchanger
Straight-tube heat exchanger 1-pass
Straight-tube heat exchanger 2-pass
3-way valve positions
Metering pump head
Conically-tapered ground glass joints
Ground glass ball and socket joints
Glass O-ring joints with elastomer O-ring in between
Simple chem distillation
Distillation by Alembic
Round-bottom flasks
Polystyrene formation
1,3-Butadiene Polymerization
City block diagram
Angle parking lot diagram
Street Intersection diagram
Real estate lot map