Figure 4-13. M60 weatherproof fuse igniter.
4-5. DEMOLITION EQUIPMENT
a. Circuit Testers.
(1) Blasting galvanometer (fig. 4-18). The
blasting galvanometer is an instrument used in testing
the electric firing systems to check the continuity of the
Figure 4-14. M1 flash-vented electric squib.
circuit (the blasting cap, firing wire, wire connections and
splices). Its components include a D'Arsonval meter
and a small, special silver-chloride battery. Where the
c. Connector, detonating cord (fig. 4-17). This
meter is connected to a closed (continuous) circuit, the
connector is cylindrical and is composed of either white
flow of current from the battery moves the meter needle
or blue plastic molding material. It is 1.72 inches long
across the scale. The extent of the needle's deflection
by 0.62 inch diameter with a 0.12 inch diameter hole
located through the body of the connector. Also, two
circuit (and on the strengths of the battery). Two types
65slots are located on the same end as the holes and
of batteries are authorized for use, one for temperature
aid in easy installation of the detonating cord. The
above 0 , and the other for temperatures below 0
detonating cord connector is used to connect two
strands of detonating cord. Connections are made more
quickly with the connector than with knots.