eternal

card 1 of 10 · context meaning

What does 'eternal' mean in this sentence?

Beneath him you might have seen the three of us - myself, sunburnt, young, and vigorous after our open-air tramp; Summerlee, solemn but still critical, behind his eternal pipe; Lord John, as keen as a razor-edge, with his supple, alert figure leaning upon his rifle, and his eager eyes fixed eagerly upon the speaker.