55.2 MB (4.8 MB compressed)
4181 x 4613 pixels
35.3 x 39.1 cm ⏐ 13.9 x 15.4 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Blasting trigger mechanism, historical artwork. The cutaway section shows the internal mechanism that is triggered by the plunger used to set off an explosion. Depressing the plunger triggers a small dynamo (the rotary motion coming from the toothed cogs) that sends an electric current down wires to ignite a blasting cap and detonate the explosives. This method avoids accidental ignition that is possible if batteries and a switch are used instead. Artwork from the third edition of 'Les Entrailles de la Terre' (1902) by French author Eugene Caustier.
Model release not required. Property release not required.