back beam

back beam

back beamclick for a larger image
A localizer with both front beam and back beam.
back beam
back beam
back beam
back beam
No change in back bearing in this case as the aircraft is flying directly south.
A reciprocal beam on the other side of a transmitter and on a reciprocal heading, as in an ILS (instrument landing system) localizer. Aircraft on a back beam may not have glide-path information.
back bearing
i. The horizontal angle, measured clock-wise from a datum, and observed from an aircraft for a point over which it has passed without an intervening alteration of a heading. It is the reciprocal of track.
ii. A bearing differing by 180°, or measured in the opposite direction from a given bearing. Also called a reciprocal bearing.
iii. The bearing at the opposite end of a line from the observer as measured from the true meridian at the opposite end of the line. The back bearing on all lines (other than north-south lines) differs from the bearing at the observer's station by the amount of convergency of the meridians between the two points.
References in periodicals archive ?
This watch had a leather band with white stitching and a few studs with both standard clock face and digital with back beam light in blue.
Rosa also made use of a ceramic tile that looks like slate, which covers the raised back beam and waterline.
During this process, back beams are processed on the dyeing and sizing machine instead of rope.
In the first stage, back beams are dyed, oxidized, dried and wound on a batch roll.
A tow hook is mounted on the front and back beams so the tractor can be hooked to a car or truck via a tow strap and pulled to fresh ground.
Two more run between the front and the back beams. After these are in place, add the 2-1/2-in.
There was no shortage of lenders willing to back Beams, which is always a good early indicator of business success."
The back beams in the same batch must be wound so that their length is exactly the same so as to minimism waste during sizing, since the batch must be finished as soon as the first beam is empty during sizing.
shorter than the side beams and fasten it to the posts and the front and back beams (E) with 3-in.
SIZE & DESCRIPTION A 6 3-1/2" x 3-1/2" x 56" treated posts B 24 3/4" x 3-1/2" x 32" treated post shims C 6 7-1/2" x 98" round columns D 12 1-1/2" x 5-1/2" round discs (column inserts) E 2 1-1/2" x 9-1/4" x 185" front and back beams F1 2 1-1/2" x 9-1/4" x 145-1/2" side beams F2 1 1-1/2" x 9-1/4" x 142-1/2" center beam G 4 3/4" x 1-1/2" x 142-1/2" ledger strips H 16 1-1/2" x 7-1/4" x 91-3/4" flat rafters J 23 1-1/16" x 3" x 33" tail tops K 23 1-1/2" x 9-1/4" x 17" decniative tails L1 8 1-1/16" x 3" x 153" lattice strips L2 1 1-1/16" x 3" x 134" center lattice strips * M 4 3/4" x 3-1/2" x 91 3/4" fascia strips * N 18 3/4" x 3-1/2" x 14-1/2" fascia strips P 24 1-1/2" x 2-1/4" x 12-1/4" sub- base (under molded base) * Cut to fit Buyer's Guide