Polar planimeter
Planimeter in fitted box
Integraph by J.Amsler with wooden case. From Royal Aircraft Establishment
1910-1920
Polar planimeter, Amsler's
1876
Amsler electrically registering current meter with case and battery box
1913-1916
Amsler's integrator; in case with rail.
1856-1890
Amsler integrator in box
Amsler-Laffon tensile testing machine
circa 1890
Photograph of Amsler current meter by Stanley
1915