nevertheless important to maintain an observation book
although it will serve for control purposes rather than for
direct data recording.
3.4 Mechanical Recording Instruments
As already mentioned, there are physical principles available
for measuring meteorological parameters, which result in
changes of the length of the sensing element or where the
sensor exerts a force. This can be transmitted mechanically
with or without amplification to a recording system, which is
usually based on a clock driven paper strip, either of the
drum or endless belt type. With regard to the magnitude of
the movements and/or the exerted forces and the technical
possibilities for mechanical amplification, mechanical
recorders have a limited accuracy and the distance between
the sensing element and the recording device has to be kept
small. The main advantage of mechanical recorders are the
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