. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 2—PRESSURE fail to feed, reopen the case and draw a piece of glossy (bond) paper through the pen nibs to start the flow. PEN AND INK.—Very little ink is needed; a half-full pen should suffice. In fact, in damp weather the nib may appear to become fuller. This is because the instrument ink is hygro- scopic and absorbs moisture. As this process continues, the trace becomes paler because of dilution. Wash and re-ink. A wide trace is caused by dust accumulated on the point, or a dull or bent point. USE BEYOND C
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 2—PRESSURE fail to feed, reopen the case and draw a piece of glossy (bond) paper through the pen nibs to start the flow. PEN AND INK.—Very little ink is needed; a half-full pen should suffice. In fact, in damp weather the nib may appear to become fuller. This is because the instrument ink is hygro- scopic and absorbs moisture. As this process continues, the trace becomes paler because of dilution. Wash and re-ink. A wide trace is caused by dust accumulated on the point, or a dull or bent point. USE BEYOND CHART RANGE.—The normal barograph chart has a range of 965 to 1,060 mb. When approaching any extreme pressure con- dition which may carry the pen off the chart, turn the adjustment knob to move the pen about 40 mb away from the close edge of the chart. When the condition is passed, reset by the exact same amount and mark the affected portion of the chart accordingly. PLASTIC SHEET WINDOW.—Use a damp cloth to clean the plastic sheet window in the case. Do not use a solvent cleaner or a dry cloth, as either can damage the plastic pane. Maintenance Very little maintenance is required for the marine barograph. This section covers such service, replacement, adjustment, and minor repair as may be needed and can be performed with no more than partial disassembly and not require the use of special tools or test equipment. Under normal operating conditions this in- strument should be cleaned well once a year. The element cover should be removed only to clean out any bulky dirt, cobwebs, etc. Do not wipe out this mechanism. Check the pen for wear or roughness and replace as necessary. The chart drive mechanism should be cleaned and oiled annually. This oiling should not be attempted by Aerographer's Mates 3 or 2 un- less they are properly instructed in the method of doing it. For other troubles with the marine baro- graph, consult the applicable instrument hand- book. BAROMETERS M
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Keywords: ., bookcentury1900, booksubjectmeteorology, booksubjectunitedstates
