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W. F. STANLEY & CO. LTD. 
OBSERVATIONS ON THE USE OF THE PLANIMETER 
It is surprising that with the use of so simple a mechanism the area of an 
irregular figure can be accurately measured—a measurement which other 
wise would be most laborious can be accomplished in a minute or two 
without requiring any special knowledge or skill on the part of the user. 
Moreover, the Planimeter requires but ordinary care in handling in order 
to retain its adjustment. The simplicity of operation is apparent from the 
following:— 
To measure any area on a plan or chart it is only necessary to— 
(i) Place the instrument in a suitable position. 
(ii) Read the measuring wheel. 
(iii) Move tracer point round the outline. 
(iv) Read the measuring wheel again. 
The difference between the two readings multiplied by a simple factor gives 
the area. 
SELECTING A PLANIMETER 
I. Area Measuring Planimeters 
In selecting the most suitable instrument for a particular application 
there are several considerations, namely Range, Accuracy, Convenience of 
operation and Cost. The tabulated data on the following pages will 
generally make this selection a relatively simple matter but the services of 
our Technical Department will be available to give recommendations in 
specific cases. 
Quote Stanley’s ‘A’ Catalogue