Take-apart machines and great structures

Take-apart machines

• FIG. 1

  Pendulum Clock

  A weight-driven clock, step by step

• FIG. 2

  Mechanical Wristwatch

  A spring-driven watch, step by step

• FIG. 3

  Four-Stroke Engine

  Intake, compression, power, exhaust

• FIG. 4

  Bicycle Drivetrain

  Pedals, chain and gears

• FIG. 5

  Pin Tumbler Lock

  Plug, pins and key

• FIG. 6

  Gutenberg Printing Press

  Screw, type and ink

• FIG. 7

  Steam Engine

  Steam, beam and flywheel

Great Structures

Seven famous structures to build up from the ground: how they stand, what they are made of and who built them.

• FIG. 1

  Pyramids of Giza

  Build it up, stone by stone

• FIG. 2

  Great Wall

  Build it up, ridge by ridge

• FIG. 3

  Eiffel Tower

  Build it up, rivet by rivet

• FIG. 4

  Tallest Skyscrapers

  Build it up, floor by floor

• FIG. 5

  Big Bridges

  Build it up, cable by cable

• FIG. 6

  Windmills

  Build it up, brick by brick and sail by sail

• FIG. 7

  Hydroelectric Dams

  Build it up, column by column