Instructions HAFF Mechanical - Planimeter 31x

for Polar-Planimeter No. 313, 315 and  317E

Contents:

                                                                                     Page

  1. Introcuction...............................................................4
  2. Important points........................................................4
  3. Using the planimeter..................................................5
          Reading examples...............................................6
          Working areas....................................................8
          The value of the Vernier Unit...............................8
          Tracing round the figure.......................................9
          Areas in different scales.....................................11
  4. Accuracy................................................................16
          Test Area..................................................... ....16
  5. Significancy for No. 313 and No. 315..............20 - 22
          1. Adjustable tracing arm...................................20
          2. Adjustable pole arm......................................21
          "Pole inside the figure".......................................21
  6. Examples of applications..................................23 - 26
          Volume of earth for an embankment...................23                   
          Weight of a lamina.............................................24
          Capacity of a reservoir......................................25
          Construction of the integral curve...................... 26
  7. Formulas............................................................... 28
Although these intructions are written on the assumption that the reader has little or no knowledge of planimeters, engineeres may well find them to be of interest, particularly towards the end of the booklet.
HAFF-Planimeters are fitted with a large, crystal-clear tracing lens, and a setting weel with which to zero the scales. The lens enlarges the view of the line being traced and so makes possible a very high degree of accuracy, the setting wheel is used to zero the scales without touching the internal mechanism.

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