Twin rulers hinges side by side that can be used to walk from one line on a chart to another that is parallel. Used for plotting a position or a course line on a chart
Related Terms |
RESTRICTOR
A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.
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ABSORBER
That part of the low side of an absorption system, used for absorbing vapor refrigerant.
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WEATHER SIDE
The side of a ship exposed to the wind.
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GRID RHUMB LINE
A line making the same oblique angle with all grid meridians. Grid parallels and meridians may be considered special cases of the grid rhumb line.
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HAND LEAD
A light sounding lead (7 to 14 pounds), usually having a line of not more than 25 fathoms
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GROUND LOG
A device for determining the course and speed over the ground in shallow water consisting of a lead or weight attached to a line. The lead is thrown overboard and allowed to rest on the bottom. The course over ground is indicated by the direction the line tends and the speed by the amount of line paid out in a unit of time.
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CASE DRAIN FILTER
A filter located in a line conducting fluid from a pump or motor housing to reservoir.
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ELASTOHYDRODYNAMIC LUBRICATION
In rolling element bearings, the elastic deformation of the bearing (flattening) as it rolls, under load, in the bearing race. This momentary flattening improves the hydrodynamic lubrication properties by converting point or line contact to surface-to-surface contact.
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SHELL PLATING
The plates forming the outer side and bottom skin of the hull
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GRID PARALLEL
A line parallel to a grid equator, connecting all points of equal grid latitude
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