BLASTING MACHINES ELECTRIC FUZES ELECTRIC SQUIBS LEADING WIRE
CONNECTING WIRE GALVANOMETERS LEADING WIRE REELS THAWING KETTLES
RHEOSTATS SAFETY FUSE BLASTING CAPS BLASTING MATS CAP CRIMPERS
TAMPING BAGS E.I.DUPONTDENEMOUR5 POWDER COMPANY WILMINGTON,
DELAWAREU5.A. PRESS OF DANDO COMPANY PHILADELPHIA Copyright, 1911
E. I. du Pont de Nemours Powder Co. Wilmington, Del. Foreword
LTHOUGH the explosive itself very naturally demands first
consideration when blasting is to be done, the fact must not be
overlooked that it cannot be properly exploded without certain
materials and appliances especially designed for the purpose, and
which are commonly known as Blasting Supplies. In addition to those
articles necessary to develop the energy of a charge of explosives,
there are other devices which, although they may not be absolutely
requisite, contribute to safety, certainty and economy in the use
of explosives, and these are also included in the category of
Blasting Supplies. The importance of keeping Blasting Supplies up
to the highest standard in every respect cannot be over- estimated,
for the very best grade costs but a trifle in comparison with the
charge of explosives with which they are used. It is poor economy
to attempt to deto- nate explosives with an inferior article, for
this always results in a considerable waste of the value of the
explos- ives. More than a hundred years experience in the
manufacture, sale and use of all kinds of explosives has taught us
that the popularity of our products depends entirely on the results
which consumers have with them. With this in view, we must, from a
standpoint of good business, if from no other, recommend only a
high quality of Blasting Supplies.251752 INDEX ADVANTAGES OF STRONG
DETONATORS - 85 BLASTING BY ELECTRICITY - - - . . 5 BLASTING CAPS -
- . - . - - 63 BLASTING MACHINES - . - . 29 BLASTING MATS - ... - -
82 BLASTING SUPPLIES AND THEIR USE - ... 1 CAP CRIMPERS - . . . - .
. CONNECTING WIRE ... . . . -77 39 DELAY ELECTRIC FUZES - - - - -17
ELECTRIC FUZES - . . . 11 ELECTRIC SQUIBS - - - - - -23 ELEMENTARY
PRINCIPLES OF ELECTRICITY - - - 91 GALVANOMETERS -.-.... 43
INTRODUCTION ..., .... LEADING WIRE... .... 39 LEADING WIRE REEL -
- 40 PRECAUTIONS TO BE OBSERVED WITH EXPLOSIVES - -114 RHEOSTATS -
55 SAFETY FUSE - . - . .... 67 TAMPING BAGS - - . - - 81 THAWING
KETTLES 78 INTRODUCTION Blasting Supplies and Their Use LECTRIC
Fuzes are the detonators used when a high explosive, such as
dynamite, is fired electric- ally. They consist of a copper
capsule, or shell, containing a detonating charge surrounding a
fine platinum bridge, which joins the tips of two insulated copper
wires of various lengths. The ends of the copper wires are secured
in the copper shell by a composition plug, which also serves to
keep moisture and water away from the charge. The Electric Fuzes .
electric fuze is detonated when sufficient current is passed
through the 5 copper wires, and across the ill platinum bridge, to
heat the latter to a temperature high enough to ignite the charge
surrounding it. Delay Delay Electric Fuzes can be used to advantage
in certain classes of tunnel or shaft excavating. These Electric
Fuzes . are made so that a very short space of time intervenes
between their ignition by the electric current and their
detonation. By their use, it is possible, with but one opera- tion
of the blasting machine, to fire one section of a blast,
sufficiently ahead of the following section, for the material in
the first to be out of the way when the next is blasted. When
several charges of explosives are to be detonated at one time with
electric fuzes, it is neces- sary unless the electric fuze wires
are long enough to reach between the bore holes to join them with
Connecting Wire. Insulated copper wire is used for this purpose...
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