Amsler integrator (without rail) engraved: "J.Amsler 106" and "Julio F.Sorzano
Polar planimeter
Integraph by J.Amsler with wooden case. From Royal Aircraft Establishment
1910-1920
Polar planimeter, Amsler's
1876
Amsler integrator in box
Amsler's integrator; in case with rail.
1856-1890
Amsler-Laffon tensile testing machine
circa 1890
Amsler electrically registering current meter with case and battery box
1913-1916
Photograph of Amsler current meter by Stanley
1915