Multiple choice general knowledge

Alexander Graham Bell is best known for inventing the telephone, but he was a man of many interests. Another product for which he received patents was:

  1. A cement-burning kiln

  2. A hydrofoil boat

  3. A “magic lantern” projector

  4. A vacuum cleaner

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alexander Graham Bell held patents for the hydrofoil boat, specifically the HD-4 which set speed records in 1919. He worked extensively on hydrofoil designs and marine engineering. The cement kiln, magic lantern projector, and vacuum cleaner were invented by others and are not associated with Bell's patents.