File:Improving crop yields by the use of dynamite (1911) (14757227961).jpg

Identifier: improvingcropyie00newy (find matches)
Title: Improving crop yields by the use of dynamite
Year: 1911 (1910s)
Authors: New York central and Hudson River railroad company. (from old catalog)
Subjects: Explosives
Publisher: (Baltimore, The Lord Baltimore press
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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with an axe, with the advantage ofthe operator being at a safe distance when the jam ** starts. BREAKING UP ROLLWAYS Forty per cent, dynamite can be used to great advantage inbreaking up * rollways of logs, large quantities of this powerfulexplosive being used each season by the lumbermen. A case ofthis explosive, thawed in the morning, will, if covered by an old coator blanket and protected from the cold, be ready for use at any timeduring that day. The huge piles of logs, frozen and bound togetherwith snow and ice, can be instantly loosened with a little dynamiteinstead of prying them apart slowly and laboriously with cant hooksand levers. At a season when time is truly money, the dynamiteused in this way saves many times its cost. The cases of dynamitecan be transported easily and safely if properly handled. No log-ging camp can afford to be without it a single day when engaged inthis work. 82 EXPLOSIVES ANDBLASTING SUPPLIES HOW TO HANDLE, STOREAND USE THEM BLASTING BY ELECTRICITY
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PRINCIPLE OF EXPLOSIVES OLASTING Explosives are divided into tw^o general classes,-^ known as high explosives and low explosives; dynamite and low powder are examples of the former, and blasting powderof the latter. They are solids, having bound up in themselves verypowerful energy, which, when properly directed, can be made todo an enormous amount of valuable work. To get them to do thiswork economically, they must be closely confined in the midst ofthe material which is to be broken or thrown out, and then exploded;that is, instantly changed from a small volume of a solid to a verylarge volume of a gas. Low explosives (blasting powder) will dobut little, if any work, if not tightly confined or corked up whenexploded, but high explosives change from a solid to a gas so quicklythat they will jar and break material on which they are lying whenthey explode, even though they are confined very little, as in mud-capping or ** blistering boulders, or if not confined at all, as whenfloating

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