‘demonstration model’ historical pictures (exact matches)

Model of a Buoy
Model of a Buoy
Model of Two Congreve Rockets with Launching Gear
Model of Two Congreve Rockets with Launching Gear
Model of a Crane
Model of a Crane
Two Models of a Lifesaving Cart for Shipwrecks
Two Models of a Lifesaving Cart for Shipwrecks
Model of a Lifeboat Release
Model of a Lifeboat Release
Model of Steering Gear
Model of Steering Gear
Model of an Optical Telegraph for Ships
Model of an Optical Telegraph for Ships
Model of a Crane for Stepping Masts
Model of a Crane for Stepping Masts