The Old-School Was Rotary
Puzzle 5 of Agatha Christie Medium Pack
Question is: The Old-School Was Rotary
and the answer is: TELEPHONE
Word Meaning:
TELEPHONE — (countable, telephony) A telecommunication device which converts data or sounds (usually speech) into electrical signals which are then transmitted to enable two or more people to communicate with each other over a distance; now usually a device having a dial or keypad with numerals for entering a number, etc., to connect with a person, and means (such as a sound or vibration) for alerting one to an incoming call or transmission; also, the handset or receiver of such a device.
Definitions from Wiktionary.