CONE ROCK BIT

A rotary drill with two hardened knurled cones which cut the rock as they roll. Also known as roller bit.

cone_rock_bit drill cones cut rock two

Related Terms

GULLY

1. A small ravine, especially one cut by running water, but through which water flows only after a rain. 2. On the sea floor, a small valley-like feature

gully water cut

INTERSECT

To cut or cross. For example, two non parallel lines in a plane intersect in a point, and a plane intersects a sphere in a circle

intersect circle parallel cut non plane sphere

RABBET

A groove cut in wood to form part of a joint.

rabbet groove joint cut_in cut form wood

A slender triangular recess cut into the faying surface of a frame or steamed timber to fit over the land of clinker planking, or cut into the faying edge of a plank or rebate to avoid feather ends on a strake of planking. The feather end is cut off to produce a nib. The joggle and nib in this case is made wide enough to allow a caulking iron to enter the seam.

joggle surface frame strake cut_off iron cut-off end cut edge fit land plank

MUSTER STATION

The location on a vessel a person goes either during an emergency or a drill to prepare for one. i.e. a Muster Drill. If a person is believed missing, all hands would report to their muster station for a head count.

muster_station drill vessel emergency head station muster prepare

ROACH

The curved cut in edge of sail for preventing chafing.

roach sail cut_in cut edge

STATION BILL

A list which shows the vessel's complement and details their various duties in connection with fire and boat drills.

station_bill drill list boat fire complement duties

CUT

1. A notch or depression produced by excavation or erosion. 2. The intersection of lines of position, constituting a fix, with particular reference to the angle of intersection

cut intersection angle reference

DELTA

1. The low alluvial land, deposited in a more or less triangular form, as the Greek letter delta, at the mouth of a river, which is often cut by several distributaries of the main stream. 2. A change in a variable quantity, such as a change in the value of the declination of a celestial body.

delta celestial cut declination low variable

ERROR ELLIPSE

The contour of equal probability density centered on the intersection of two straight lines of position which results from the one-dimensional normal error distribution associated with each line. For the 50 percent error ellipse, there is a 50 percent probability that a fix will lie within such ellipse. If the angle of cut i

error_ellipse position density intersection angle error angle_of_cut contour cut fix normal

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