Nr. 469
Polar integraph of prof. M. Franck
Row: 1

Nr. 553
Integration triangles from Thaer
Row: 2

Nr. 537
Planimeter
Row: 2

Nr. 548
Surface measure plaques from Kloth
Row: 2

Nr. 538
Harp planimeter from Oldendorp
Row: 2

Nr. 538
Harp planimeter from Oldendorp
Row: 2

Nr. 532
Polar planimeter with calibration ruler
Row: 2

Nr. 531
Polar planimeter with calibration circuit
Row: 2

Nr. 534
Optical planimeter from Schnöckel
Row: 2

Nr. 526
Moment planimeter from Amsler
Row: 3

Nr. 527
Integraph from Coradi
Row: 4

Nr. 525
Integraph from Abdank-Abakanowicz Coradi
Row: 4