Drawings

Dimensioned drawings for the bench build. Millimetres throughout, not to scale on screen.

RWL-001 — Filtration column

Vertical section through the column: four media layers, the water charge above them, the screen and valve below. The media schedule gives depth, volume and an indicative mass for each layer.

Vertical section of the filtration column showing four media layers with dimensions — RWL-001 REV AFill by depth, not by mass. If the body is stacked PET bottles rather than a 75 mm tube, the bore changes and the masses in the schedule no longer apply.open full size

RWL-002 — Photometric rig

Plan view of the photographic setup used to measure turbidity, plus a diagram of the frame the camera should produce. Distances matter less than the fact that nothing moves once a session starts.

Plan view of the photographic rig with camera, sample jar, target card and white reference card — RWL-002 REV AThe white card cancels exposure differences between shots. Without it, a cloudier sample and a darker room are indistinguishable.open full size