UNIT 3: First Headlamps

1. 1. A lamp that used burning wood

1. 2. Lamps rugged enough to use with cars

1. 3. A lamp that generated its own electricity

1. 4. The drawbacks of using flames for light

1. 5. Lamps that used reflectors to cast more intense light

1. 2. Lamps rugged enough to use with cars

1. 3. A lamp that generated its own electricity

1. 4. The drawbacks of using flames for light

2. 5. Lamps that used reflectors to cast more intense light

1. 6. A reason why freight trains traveled at night

1. A lamp that used burning wood

1. 2. Lamps rugged enough to use with cars

2. 3. A lamp that generated its own electricity

1. 4. The drawbacks of using flames for light

1. 5. Lamps that used reflectors to cast more intense light

1. 2. Lamps rugged enough to use with cars

2. 3. A lamp that generated its own electricity

1. 4. The drawbacks of using flames for light

1. 5. Lamps that used reflectors to cast more intense light

1. 6. A reason why freight trains traveled at night

1. A lamp that used burning wood

1. 2. Lamps rugged enough to use with cars

1. 3. A lamp that generated its own electricity

2. 4. The drawbacks of using flames for light

1. 5. Lamps that used reflectors to cast more intense light