1 - NGA

MIL-HDBK-850
brokon tspe meeessramont-(rtuweying)
The short ttietaxm measured ati msamsutsfed
to totat a full tape length when a standard 1OOfoot
tape cernof be hekf hortzontatty wtfhout
Pkmbtng from above ehcdder level. Aleo ceSed
break tape; breaking taps.
broken teloecope transit-A precise
aefronomk fransti tn which the light entering the
objedlve isne fa mtlecdad al right anglee by a
prfem pieced wtthln the leleeccpe, the refbctad
Iiht ray peaslrq to Ihe eyeple~, whkh is in the
horizontal ruda of the telescope.
Brown grevlty ●ppemtu~n apparetua for
rnaasurtng the accwlenstion of gravity which
utilizes the Mendenhall pendulum, but has a
clamping devbe for hofd~ the pendulum In the
receiver when beino franaported fmm station to
station, and which ufifizes an efectricel pickup
and amplifying devtce tor raccmting the
oeciltatiins (pendulum) on the chronograph
sheet.
browWng--System capability to find en
undefined feature or set of features in a spatial
data base.
Brunton compas~An instrument combining
the teetures of both the sighting compass and
the clinometer that can be used in lhe hand or
upon a Jacob’s staff or light tripod tor reachg
horizontal and vertical argtes, for leveling, and
tor reading ma magnetic bearing of a line. Afao
called Rrunton pockat tmrmlt.
Brunton pockst transit—Se e Brunt on
compass.
bubble axIa—See splrlt teval axla.
bubble level-See splrlt Ievsl.
bubbkr 8extanl-A aextanf in which the
bubble of a spirit level serves as the horizon.
bucking In—The act of aligning a lheodofite to
a collimator or aumcolfimating theodoiite serving
as mltimator to make their lines of sight perallel
and on fhe same plane.
buO-An error In a rmrnputer program or in a
piaca of electronic equipmanf ttraf causea tf 10
furwtion Improperly.
bull’o-eye level-See circular level.
34
Bullsrd method of Iaostatlc rerluctlon-
See tIayford.Bullsrd (or Bullsrd) mathod
ot Isostatlc mductlon.
burn+tilhogrephy) The process of exposing a
pressplate.
byte—1. A group of adjacent btfs that are
operated on es one unit. Eight bits equal one
byte. 2. A storage unlf ec@velenf to an ASCII
character of Information in a carrputer system.
S= curve method-A method ufillzlng
characferfstka of tha Bz curve for finding the
dk$rtacement o! true photo ptumb pims from
indicated projector plurrb points in rnuftiplex St*
orientation. The method also provides a means
of strip leveling usir’g only the bemmetnc
attimeter readings of the aircraft flying haight.
Sz curve-(photogrammat~) A graphical
representafbn of the vertical errora In a
atereotr’angulatad atnp. In a Bz curve, the xmordinatea
of the verlical comrol points,
referred to the initial nadir pokrt as origlr’t are
pbned as abscissas, and the differences
between the known elevafiins of the mntrol
paims and their e!evelkma as read in the
stereo! riangulated strip are plotted as ordinates;
a srrwoth curve drawn through the ptottad
points k fhe Bz curve. The elavation read on
any pass point in the strip is adpated by the
arnoum of the ordhmte of the Bz curve Ior an
abacisaa mrrespc.nding to the x-coordinate of
the Ooinl.
.