Page:Popular Science Monthly Volume 74.djvu/444

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440

��THE POFrL.iR SCIESl

��STHLT

��It dxMiM be not^, howrrer, that there h« been little d« 

tW CA&al fxcftvation on the I e isthmus,* tt mad

Oiklkn briow ! i U Uhe I The work

��n..w

��~, hereafter, 'rogren cm

vhkh can

Tt>riL It m

��^u6a Hill

��abas- ii to

��^QS {mx has r> Uic v

«r " "^^uirement for •« 

be iv.a.ntaineii, as DOW shov bait be anfwered b^ *^ -^ -^^

protebk that the :_.-.

f^f T\rv>r!v« if m oaff cred br rards of ex

. . dams coi : rirr, from

hifb gronad at « -^l to Sosa IlilU va.- ^' >:on foimd

that theae atiui' tmea were ill-advi«ed. '\ e mtick and mod of the « ManglaTV^ d not support the loa *( a moderate fill There

much - ' and lateral d Laplace:

This was in no wise fatal to red the f Miraflof^v vhere excavauon iur illux u

The wx>^' the main dam, t^ .;^, has barely com-

». ' "^ :.-^ u*m will be of eauii , ave a crest laig& of

^Jtgj^ ' • --1 - v,..-,i^}j of > ... * ^ and down stzcan,

0f 0, . ^"t T-ial of which the

-,alic metiiod.

-. and a practically

-ited acroas the

_' and slippiag d a

of the proposed

'iiere will be other slips imtil

nder and particokriy near

The dooblB

��Tb* Trmtfrial V .

it . and safe body of earth v

Tmlier ^f the Cbagrea at Gattir rock -t was being pla.

•tractore is of do gre^t ice.

diq>beeneDt of lajers of yielding ma' the edges of soch fills, is sufficient to ftT?«"* g the feasibility of a Etructure fe«r of sue- • the ur • -

vmtcr at oou. tent and permc^ar:..!} ( '••rings aDd shaft' *

��11 ^ daa

��/.^_-^i I ... ,,.^

��ATS

��a mofeneDi of depoaila, flie ex- .^rmatioD ob t a iwfd or leas ooojectinaL ■■m the safety of the

« resatt.

are f_ ■ " b«t little basia for fliem.

71,,. , ;ry to the dam froi a moderate underflor if wit-

Able r^ are taken to let the wter come to the surface at flie

dc/wn-rtream toe of the dam throng' and, gravel and beofcen rock • InU^rm^tUm U |mbli.i»d ia tk* Co- 4 oi Ttbraxrj 10, 1»», tfcit

ih» Fr«>4r«t la Ortobrr, 1«HJ, autborittid « widening of t^ ^^"^^ •ItWo Ti»0f«4<mtfc« bottom toOO fe«t. Tfci* f««t ^—

tW .r,^« WM writt«i. TV pn tm of wideaiaf with* ^ ^

tkt .t^r.f d*T»tfc of this MctiB of the eaaal may be apttUd to , tk*T*i<fr; aomt tiam loagvr.

��^Uemlly

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