Illustration of the relative sizes of the one-man Mercury spacecraft, the two-man Gemini spacecraft, and the three-man Apollo spacecraft. Also shows line drawing of launch vehicles (Saturn V, Titan II and Atlas-D) to show their relative size to each other and the position of the spacecraft at launch (highlighted at top).

Illustration of the relative sizes of the one-man Mercury spacecraft, the two-man Gemini spacecraft, and the three-man Apollo spacecraft. Also shows line drawing of launch vehicles (Saturn V, Titan II and Atlas-D) to show their relative size to each other and the position of the spacecraft at launch (highlighted at top).
More info here:https://commons.wikimedia.org/wiki/File:NASA_spacecraft_comparison.jpg