Examples from the Web for planimeter
Measuring the card with a planimeter shows the mean effective pressure to be 48.2 pounds.Steam Engines|Anonymous
If the error of its reading be not sensibly greater than that of a planimeter, it is certainly worth double the money.
The planimeter affords a much quicker and more accurate method of obtaining the average steam pressure from a diagram.Modern Machine-Shop Practice, Volumes I and II|Joshua Rose
At least two such readings were taken for each home range; then these planimeter values were converted into square feet.
Amsler's planimeter was taken as the standard, the area measured by it being independently checked by an assistant.