w_^OTl.j^lPiiwiii«i«*ii-u™>«—« nmi«»n^»^MHwwi . -j;rcninß Post" Photo. BIG SHOTS l!\ QUARRIES.—To get, ruck, fur the protection oj the sea wall of the railway embankment the-Public Works Department put in. a series of big shot): in a quarry in the llorokiwi Valley. On the left may be seen the hillside after several smaller shots; and to ihc right, the result oj the firing of 'JVOOIb of gelignite in one shot. An article elsewhere tails how the calculations are made to dislodge the requireil qv.anW.y of rock. In the picture.to the left may be seen landmarks which remain after the explosion, and it says something for the correctness' of the- formulae used that,the hULside broke to with. in it foot ajt.the calculated spot. Tbm radius of llw effect, of isi.tch charges can be calculated very accurately. i

Evening Post, Volume CX, Issue 148, 20 December 1930, Page 17

w _^ OT l.j^lPiiwiii«i«*ii-u™>«—« nmi«»n^»^MHwwi . -j;rcninß Post" Photo. BIG SHOTS l!\ QUARRIES. — To get, ruck, fur the protection oj the sea wall of the railway embankment the-Public Works Department put in. a series of big shot): in a quarry in the llorokiwi Valley. On the left may be seen the hillside after several smaller shots; and to ihc right, the result oj the firing of 'JVOOIb of gelignite in one shot. An article elsewhere tails how the calculations are made to dislodge the requireil qv.anW.y of rock. In the picture.to the left may be seen landmarks which remain after the explosion, and it says something for the correctness' of the- formulae used that,the hULside broke to with- . in it foot aj t .the calculated spot. Tbm radius of llw effect, of isi.tch charges can be calculated very accurately. i