Notes: "This is an Amsler Type 2 planimeter that was sold in the UK by W.F. Stanley. The pole arm is marked ""Stanley, Great Turnstile, Holborn, London. Agent."" The ""Agent"" part is important. Stanley became the sole agent for Amsler planimeters in the UK in 1875, meaning this planimeter was made after 1875. The serial number is 45947, which would put it somewhere around 1905. "
