Based on the information provided within the question it can be said that the feature that is being described is called the Measurement Protocol. This is a feature that allows any device that is connected to the internet to send data to Google Analytics, and can be used on many devices that cannot access the website or mobile application such as a point-of-sale system.
I <u>believe</u> the answer is the 1820, as the introduction of steam powered printing presses and steam powered paper mills significantly lowered the cost of books to decrease and significantly increased their circulation/availability.
