Marker

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marker

[′märk·ər]
(immunology)
Any antigen that serves to distinguish cell types.
(ordnance)
A sign or signal for marking a location on land or water; frequently contains pyrotechnics.

Marker

 

a device for guiding a sower or planter to form interrows of a planned width. A marker consists of an extendable bar connected by a hinge to a sower or hitch. On the outer end of the bar is a disk, which is mounted at an angle and rotates freely; as it moves over the field, it leaves a furrow in the un-seeded area. On the next pass of the unit the furrow is used to guide the right front wheel or the inside edge of the right track of a tractor. Sowers and planters usually operate with right and left markers. The overlap (M) of the marker is determined according to the following formulas:

where a is the distance between the front wheels or the inside edges of the tracks, B is the distance between the extreme colters of the sower, and C is the size of the interrow.


Marker

 

an attachment to a single- or double-row sower that ensures parallel rows of seeds in subsequent passes. A marker consists of a beam with a weight on the end; the beam is secured to the front of the tractor. The tractor is steered so that the weight of the marker is above the track left by the planter wheel or marker disk on the preceding pass. Markers are often made reversible so that they can be used on both sides of the tractor.

marker

A sign, plaque, or monument that designates a building, site of historic importance, or boundary.

marker

markerclick for a larger image
Distance to go markers on the sides of runway.
An object displayed above ground level in order to indicate an obstacle or delineate a boundary (ICAO). Markers should be frangible, and those located near a runway or taxiway should be sufficiently low to ensure clearance for propellers and the engine pods of jet aircraft. The various types of markers are the distance-to-go markers, unpaved runway-edge markers, stop-way-edge markers, taxiway-edge markers, taxiway centerline markers, boundary markers, and unpaved taxiway-edge markers.
References in periodicals archive ?
Simon Parish wrestled with oil paints on big canvases but is now attracting attention by making pictures with marker pens.
Even fundamental packing items and other accessories which are easily forgotten such as wrapping paper, bubblewrap, packing tape, contents labels and marker pens are all available as well as a check list to remind customers about the various tasks required when moving.
All the black decorations were applied with the black marker pen.
And alongside paint, Andrew Bick uses wax, marker pen and perspex to reveal a process of painting as a visual puzzle.
The tag is the word 'Buck' and has been seen written in marker pen and gold spray paint.
All neighbourhood policing teams have been issued with cycle security kits, consisting of a special marker pen to mark bikes with their owner's post code and ultraviolet lights so that officers can check bikes whilst out on patrol.
The superstar DJ - real name Norman Cook - wrote the jokey message in black marker pen, with a heart underneath.
Photo (1) David Hockney mixes shapes - and mediums - in 1989's "Geometric Waves," using ink, gouache, marker pen and crayon.
A black marker pen was used to cause extensive damage to furniture on the train during its journey between Birmingham New Street and Selly Oak stations.
Use a permanent marker pen or ultra-violet marker pen to mark valuable goods and presents.
Police are urging people to get a lock and to have their house number and postcode engraved or security marked on their bike using a permanent ultraviolet marker pen.