A vintage Proctor soil compaction test apparatus, traditionally used in geotechnical and civil engineering applications to measure soil density and moisture relationships. The set includes a brass compaction mould, detachable collar, and metal clamp assembly with adjustment screws. This apparatus was typically used in laboratories and fieldwork for road construction and foundation testing. Some wear, patina, and surface rust consistent with age and prior use. An interesting collectible piece of engineering equipment, functional as a teaching aid or display item.