Ellison air brick, one of twelve models for instruction in hygiene. Ellison air brick, one of twelve hygiene models 1896
Tin solder trap model, stilt bucket type, from twelve models for instruction in hygiene models, England, 1896 Gulley trap insert model 1896
Gulley trap insert with removable strainer plate, from twelve models for instruction in hygiene models, England, 1896 Gulley trap insert with removable strainer plate 1896
Three drain pipes, one of twelve sets of models for instruction in hygiene, Three drain pipes models 1896