此款求積儀是由美國紐約的James L. Robertson & Sons公司製造銷售，發明人是Alpheus C. Lippincott (1896年)，工作原理與極座標式求積儀相同。此款求積儀的特色為追蹤桿可以調整長度，且滾動輪是在一個可更換的玻璃管上滑動，玻璃管內提供量測刻度。套件組中配有三種不同刻度的玻璃管，可以使用於不同應用之量測。

This planimeter was manufactured and sold by James L. Robertson & Sons of New York, USA. It was invented by Alpheus C. Lippincott in 1896 and operates on the same principle as the polar planimeter. A key feature of this planimeter is that the tracing arm can be adjusted in length, and the rolling wheel slides on an exchangeble glass tube, which provides measurement scales. The toolkit includes three different glass tubes with various scales, allowing for measurements in different applications.