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Barograph User’s Manual
5.3. Replacing the Chart Paper
At the end of the drum revolution cycle, move the pen-arm away from the drum using the lever at-
tached to the Disengaging rod (see section 2.1 Mechanical Diagram). Then remove the recording
drum from the clockwork. Remove the clamp holding the chart paper to the recording drum and re-
move the used chart paper. Wrap a new chart paper around the drum so that the slightly overlapping
edges line up with the location of the clamp (see diagram 5.3). Be sure that the bottom (low pressure)
side of the chart paper is lined up directly with the lip on the lower edge of the recording drum. Insert
the clamp in the slot at the base of the drum and clip it at the top.
After the paper is loaded, replace the drum on the clockwork with the time and date approximately
aligned with the pen position. Once the chart is in place and the pen is returned to the chart, make a
final manual rotation of the drum to the correct time as needed. This may take a further adjustment
after some time has passed to remove slack in the gear.
Warning: If the barograph has a mechanical clockwork, the clockwork key must be unscrewed (in the
clockwise direction) before removing the recording drum. Likewise it must be screwed back in (coun-
ter-clockwise) after it the drum has been replaced.