Nr. 550
Calculating plaque from Proell
Row: 1

Nr. 563
Ruler made of celluloid from du Bois and R. Rothe
Row: 1

Nr. 576
2 rulers according to du Bois made of celluloid for the integration of differential equations
Row: 1

Nr. 675
Etchings of plane slices of twisted iron bars according to Fry
Row: 1

Nr. 681
Torsion experiment at a marble cylinder, typical torsion fracture
Row: 2

Nr. 678
Etchings of plane slices of twisted iron bars according to Fry
Row: 2

Nr. 677
Etchings of plane slices of twisted iron bars according to Fry
Row: 2

Nr. 676
Etchings of plane slices of twisted iron bars according to Fry
Row: 2

Nr. 682
Compression test with sandstone cylinder
Row: 3

Nr. 683
Compression test with a marble cylinder
Row: 3

Nr. 684
Compression test with a marble cylinder
Row: 3

Nr. 836
Springbow of Wichmann
Row: 3

Nr. 882

Row: 4