Hydraulic invention: No need to clamber for theater seating

Next time someone disrupts your evening by clambering in or out of a nearby theatre seat, remember: it needn’t be this way. In 1924, Louis J Duprey of Dorchester, Massachusetts, patented a system that “permits any patron of the theatre to enter or leave his place without at all disturbing other patrons”. You, the patron, entered vertically, […]