![](https://coimages.sciencemuseumgroup.org.uk/315/813/large_thumbnail_smg00045600.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/315/813/large_thumbnail_smg00045600.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/315/817/large_thumbnail_smg00045604.jpg)
Monochord with notched base
![](https://coimages.sciencemuseumgroup.org.uk/316/996/large_thumbnail_smg00045598.jpg)
Monochord with triangular tapering hollow base
![](https://coimages.sciencemuseumgroup.org.uk/316/995/large_thumbnail_smg00045597.jpg)
Monochord with sound box in channel shaped base board
![](https://coimages.sciencemuseumgroup.org.uk/513/188/large_thumbnail_smg00323258.jpg)
Struycken monochord (cased) made by H. Pfau of Berlin circa 1930
1930
![](https://coimages.sciencemuseumgroup.org.uk/315/812/large_thumbnail_smg00045599.jpg)
Monochord with adjustable sound box
![](https://coimages.sciencemuseumgroup.org.uk/316/994/large_thumbnail_smg00045596.jpg)
Monochord with tapering end
![](https://coimages.sciencemuseumgroup.org.uk/315/814/large_thumbnail_smg00045601.jpg)