Manual dumb-waiter, interior of the Vaccine Laboratory. The manual dumb-waiter was originally operated by ropes to allow for the convenient transportation of specimens between floors.病理學研究院內部的人力操作貨物升降機。人力操作貨物升降機原是用鋼纜拉動，用作輸送化驗樣本及儀器到各樓層。