63

CALCULATION-ARCH AND ABUTMENT PIER.

Fig. 12.

OG — m — x and put any angle ylm = gfh = <p.As ON:OL :: OL: OGn : OL :: OL : m — xOL 2 x=.nm — nx

OL rrr nm — nxDK = EF + 2v/ nm — nx

As KW : WY :: rad.: tang. <p

WY WY wv ,

Tang, f = WY = OL = n tang. f

As KW: KY :: rad. : sec. <p

Sec. p rz

KY _ KYKW n

KY r= n sec.

DK = EF + 2 n tang. <pAs fg :gh :: hi ( gh ): ik — Vd — Vwn: gh :: gh:m — xgh 2 = nm — nx

gh ~ y /nm — nxdie = ef -{- 2 nm — nxAsfg : gA :: rad.: tang. <p

Ta „ g . f =-

n

.*. gh — n tang. <pAsJ^ - : fh :: rad.: sec. ?

Sec. f =/ 4 =■&

.fg »

;.fh — n sec. <pdk — ef 4- 2 n tang. <pky -fh