drums, mm; lhe ham ilsell is a duck an lzvcls This
.5 a bubble lzvel winch ean alae be [med .e any vehicle
on (inns, and ie ealled lhe Lung Inelmomelem
(Prmmrllllure qum' m, lassl

THE "A" FRAME ms is mad! [mm Mo wooden or
meal legs, lulled or welded firmly legelheeal lhe apex.
and llxed aboul lwmhnas down the" lznglh by a
welded on naaled and gluzd New“ A plumb box:
or weiyu hangs hum a mad at the cvnh? at me apex,
and a mark ls made on (he ewes—plea a| lhe cord lme,
The "A" name )5 lhen mvustd, and Anolhu milk
made where me curd lunches lhe cross-piece 1he
midvpninl between me two marks ls tha! poml wheee
me mad hangs when lhe [eel nl lhe name ix: levgl
(figure 9.»

In use, a peeson swwels lhe ham: album one 12g, and
ms m the second leg |o me plaee when lhe (“rd hang
vulllcnl A peg )5 pm in lempemily, tn )udgz when |n
plaee lhe n00 leg Many menes ol dram luv: been sex
m using A frames, ehen made an mespm lmm lumber,
cord, and a weaghl lm m. plumb bub

16

TYPES OF EARTHWORKS

HANKS
n )5 (heapu (o mnslrucl a lam lhan le slrp 0r mam
lhe eanh, ll lhe bank ean be made stable Wheuvu a
lourrway mm Wheel 01 annn or power shovel can
be used ha dlsh lhe bank may mu .emam suble al
gleamslopeslhanasnmghlmma (thaw rmslmlcd
s Isl-Imp by glvmg n lhe pmme u wnnld aclueve had
' lumped. Bank: or nus ul mare lhan o m high need
rattlu|slablhsauon

Unllke dam walls, culs Yo! roads am no: nnvmally
mmpaned, nor an lhey neeeesanly have much pmssmv
an lhem 1h. gma|es| eanee er slump .s waler (low
lhmugh or over henae and me liz el mala m shaly

 

 

 

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234