此款徑向式求積儀是由美國的Foxboro公司製造，專利發布於 1919年8月26日，通常用於量測紀錄於圓形圖表的平均溫度或流體流量。其特色為移動的不是追蹤點而是紀錄紙本身，靠紀錄紙的旋轉帶動紀錄輪滾動。

This radial planimeter was manufactured by Foxboro Company in the USA, with the patent released on August 26, 1919. It is typically used to measure average temperature or fluid flow recorded on circular charts. A notable feature is that it is not the tracing point that moves but the recording paper itself. The rotation of the recording paper drives the recording wheel to roll.