No_2_February_1969 — Page 32

30

Spiral staircase

Isometric

Section

PRECAST FAIR-FACE

CONC. STEP

PRECAST FAIR FACE!

CONC. STEP

X

1/2"x 1/2" HARD RUBBER STRIP

L

T

14" HOLE

3!6"

Plan of precast r.c.c. tread

Elevation

Section X - X

AG.LPIPE

SCALE

3

4 FT.

X

22"

L

I" G.I.PIPE 22 DIA. 1/8 THICK

PLATE WELDED TO "G. I. PIPE -

3"]

"WASHER

I NUT

Far East BUILDER, February 1969