The Atlanta constitution. [volume] (Atlanta, Ga.) 1885-19??, 1903-12-14

49, az III; ssts.s

essential requisite ~ terrEce-nakfng fs
| that the lines be run on An excct level,
| the Importance Of a perfect ieveIng In
| strument will be at once recognized.
With each instrument is supplied
leveling staff. with target which Is
movable UP and down. and she staT is
graduated In feet and inches DIETER feet.
tenths and hurdredths}. With q good
telescope levclne Instrument these feet
and inch marks and figures Inay be read
100 to $50 feet away. and which, viii be
found very convenient in runnins, grade
bitches.
TO LAY OFF THE TERRACES.
Set the leveling Instrument at the high
est point in the field, or portion OF the
field, 70 be ,erraced. and rs far from
where the first terrace lire Will COM
mence as the operator can see the target
distinctly through the sights. BY means
Of the leveling screws (or other apDl
anco for lcVelng the sighting tube} ad-
just to perfect level Bring the STAFF
10 the side oS tho Instrument and slide
the target until It's center is exactly on
a line with ti,S sights. Then slide it
up iust three feet higher and secure it
Ii. that position. The assistant now goes
directly down the slope until he Judges
,
feet lower than that at which tho in
strument is located. He faces the oper-
ator and at signals from The LATTER moves
| the staff UP and down tho bill, till tho
target IL in level Inc with the sights
OF the Instrument, when tho operator
vii. cry, That's right" Crhc commands.
cup and down mean thnt the staff
must be moved up or down the slope.
The assistant now sticks twelve inch
peg al the foot Of the staff, and i'm
nediatcly moves She latter about IS feet
;.iong the level line toward the beginning
pace CT the terrace line, and repeats the
operation }ust described as directed by
the operator, and go on till he reaches
the beginning end. He then goes back
under The direction of this operator TO
The next l5-foot station Beyond the first
location, t&e operator turns his sights
OF the starr again ana 50 on unui the
staff gets as fac IS tho operator can
sec the target detinctiy. Whcn this
last point is reached the assistant hoida
the staff in it, position TIE operator
moves his instrument along n the direc-
ton OF the other end Of tia projected
terrace line as FAR as be can look back
and sec the target. Fla now sets up the
tripod. levels his instrument accurately.
directs the assistant 10 slide the target
up o. down until II comedies with the
sights; the assistant sets hts peg. re
moves his sta6 70 another l5-!oOt sta
ton. and SO on rs before.
When the farther end Of tho terrace
lire Is reached by The assistant the tar
ct may be slid M feet higher, iH
Inc staff be long aacngh. nnd drop down
The slope % oegin ;he next terrace lre.
II the stan shouil he too short 10 admit
OF moving the target feet higher, then
the assistant should Dc directed TO hold
the starr in the last position or the line
Just run, the operator moves his level /
jag instrum ut dow. the slope 10 about
where tie neXt terrace line Mn RIA, ad-
iusts tho sighting troe. tt:-1s ii 20 the
stan effects the target 20 BE- aia down
until On y level l!ne with the sights.
them directs Il 70 Ito STA lip feet
hief- ar e"cured. The assistant then
pot, gov .ope 60 ABOUT the sup
r,osed location % tne next terrace line
ana the work goes on - Described until
the lowest point III The 1cid, or poT
ton OF the Held is reached.
I. IS very w,n sometimes, 10 mark the
first enl last po..tion ~ nv staff on
each terrace line by driving a stake
down. or setting a stone. 80 that the
top OF lie stake or ot the stone, shall he
VI just the Same leyei a; Which the
Ioot OF he stan w"s hid.
RECTtFYrNr THE TtKRA(z. LINE,
At ary t!me the operator may qui!
MS nstrnmeat ana Greet Vie permanent
.dius,msnt az il.c line alrea,.g markell
is the Iess Snch e Hire viii % more
or ieas ~ aie2as contour, and win