1 - NGA

1
MI L-HDBK-850
COneisb of d~rbuting the excess of dakiancy
bafwaam fwu existent comers in euch s way thet siphon baromater-A mercwy bemrneter
the emount given to each krtarvat shall bear the rxmsisting of e column of metcury m e gtesa
acme propc+tion to the whole d~ererrw as the 1* Whii is bard S0 8s to heve two vettical
rawrd length of the interval bears to the whole brenches. ene abeut one-fourth the Iemgth cd
record +s4ance. Attar heving applied the the other. The end cd the kmgar bmnch is
PWrfW@e difference to the record length of cbaad, endtheair krffiedwbytha
aech Irrtervat, the sum of the several parts will nvmury, but the shorter branch is feft open, and
aquel the new rneesurarnerd of Ihe whale
distance.
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the memury is thereby subjected 10 atrnO@Wic
Pra=ure. ha dtierenca of the height d the
mercury in the hw branches is a measure et the
slngl-besrr method-A technique of etrnwpheric pressure.
barornalrk leveling utilizing two beromatera. One
barumawr is dasignstd se a base and a nltustlon map-(JCS) A rnep showing the
second,, or revirrg, barurrreter is uesd to tectical or edrminMrative sfiuetion et e patl”tifer
detemrma pressures at specific pints. The and time. Sea afso map.
pressure arc recorded S! each poeitic+r ooc@ad
by the roving bemmeter and tires end pressure slxtoonth soctlon corner—A wmer et an
ere recorded every 5 minutes by the besa
esiremify of a boundary of a quarterquarfer
baremeler. Data ere reduced to elevations
OffiCe computations. See also barometric
by section; midpeint between or 20 cheins from the
mntmlling cornem on the section or townstilp
leveling.
boundaries. Written es 1/16 section caner. Also
●lngle-hcadlng rader prediction-A reder
called quarferquarter section corner.
prediction made for a single aircraft poaitiin or size-l. To coat with eny of the various
fmm one specfii peint in reletien to the targe!. II glutinaus msteriels used for filling the pores in
mey be either an experience or an enalyiicsl the sufiace of pepar, fbr, er of a rnoseicking
,. prediction.. bard. Z. To cakxlate tha msssuremants .. . ..required
in photographing a mep to a desired
single-mocfel instrument—A general class scale.
of sterawxiic plotting instruments with a
@W~ll”W for Pmie~in9 a s!n91e ~er~m~el
setup. This cle= of pbtter IS dsaignad for
Per SIZI ng tho lithe-An operetion performed
order to determine the estual mmsuramenl
in
S$
Wmpiktion only end is dependent upon
the original tiihegrephic maps to be used es
supplementary photogremmetric Techniques 10 aeurce for e mep revision in erder 10 determine
accomplish nace!wery sterecrlriangulation. whet distortion and changes of dhnana”bns ere
nacassary 10 fi the okf map inside the new
single-point transfer Instrument—Any projection.
irstrumerd used for the transfer of planimetric
dateil frrrm a single photograph. These
akatch map-A msp made from loose,
instruments are of two general types, reflecting unconwollad suweys. The information thereon is
projscfor and camera Iucide. generslly s+arse.
single-projector method—See one-awfng
method.
●lrrgla-terget Ievellng rod-Any target rod
having graduations on one fete onfy.
slnuaoldel map projection-A particular
type of ha Benne rnep projection, empleying
Ihe Equetor as the slandsrd persllel, and
showing all geographic parellets es trufy spaced
psrellel atreight lines, along which asset scale is
prasenfad. Thks is an equel.aras mep projection.
Also called Msrrcetor aquel-aree mep
projactlon. See also Saneon-Flamsteed
map projection.
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sketchmaster—A form of camara Iucida that
permits superimposition of a rectified virtuel
irrmge of a pfrotogreph over a map menuscrfp.
See also oblique ●kotchmaetaq unlverael
anafog photographic rectiflcetlon
system; universal sketchmester; vertical
●ketch master.
skewed map projection-Any ctandard
projedien used in map or chart coneirucfien
whkh daas net cenform to a general nertfraoulh
formal with reletion to the neallirras of the
map or chart.
slant ranga-(JCS) The line-of-sight distance