1. Hele-Shaw variable stroke pump engine Collection: Early 20th Century Engineering Lantern Slides Set: Cramer's Date: undated Format: Image Agent: unknown
2. Steering gear ram and telemotor on ship Collection: Early 20th Century Engineering Lantern Slides Set: Cramer's Date: undated Format: Image Agent: unknown
3. Diagram of hydraulic windlass with hydraulic pump equipped with stroke regulator. Collection: Early 20th Century Engineering Lantern Slides Set: Cramer's Date: undated Format: Image Agent: unknown
4. Hand operated filling pump Collection: Early 20th Century Engineering Lantern Slides Set: Cramer's Date: undated Format: Image Agent: unknown
