Show 7 ent 44 avo avoid d guesswork Quess guesswork work this hl s bulletin will help hel A hand level and a tape are all y you ou need to calculate accurately the correct amount and distribution of explosives plo for most well drill shots no matter how high or how sloping the face of the open pit or quarry may be you can find the burden on each hole by a simple method described in scientific quarry blasting once this is known you can load with much more certainty of obtaining good results guesswork is often relied upon in in loading well drilled holes but even when the guess is based on long experience peri ence it seldom attains scientific accuracy A little figuring beforehand will save a lot more than the cost of the time it takes to do it other chapters of this bulletin which is published by the hercules powder co discuss the comparative effect of different explosives in both pocket and column loading and special methods by which unusual blasting problems have been solved it also gives record systems used at open pit mines and quarries and a set of useful tables write for a free copy to our advertising department king kincy street wilmington delaware Z louisville ky pittsburgh pittsburg pa salt lake city utah pa chicago III Ha hazleton deton pa new york city pottsville spottsville Potts ville pa san francisco calif birmingham ala denver colo Huntingto nW va norristown pa st louis mo wilkes barre pa buffalo N y duluth minn joplin mo kan wilmington del pittsburg chattanooga tenn los angeles calif |