lighthouse

Everyday

A lighthouse is a tall tower by the sea with a bright light at the top that flashes to guide ships at night and warn them of rocks. tree →

In the lessons

In maths: a place in a story; its height, steps or the time between flashes are counted; flashes «every 10 seconds» make a pattern in time. In history and science: each lighthouse has its own pattern of flashes so sailors know which one it is; a lighthouse keeper looked after the light. In stories: a lonely lighthouse on a rocky island. Phrases: lighthouse keeper, lighthouse beam, the lighthouse flashes.

Examples

• The lighthouse has 120 steps. tree →
• Its light flashes every 10 seconds. tree →
• The lighthouse is 30 m tall. tree →
• How many flashes in one minute? tree →
• The lighthouse warned the ships away from the rocks. tree →
• We climbed to the top of the lighthouse. tree →
• The lighthouse keeper lived in a little house nearby. tree →
• At night we saw the lighthouse beam sweep across the sea. tree →
• Strong hands grasped the oars, and by and by all were safe in the lighthouse. tree →

Note

One word: light + house. Countable. A story place; steps, height or flashes may be counted. Trap: flashes «every 10 seconds» in a minute starting at 0 gives 7, not 6.