I just scanned another disaster story, Robert Barr's "Within an Ace of the End of the World," which is an interesting precursor of Doyle's The Poison Belt but written in 1900 and with a less happy ending - sixteen survivors, 8 British men and 8 American women, who are the only ones to take the oncoming crisis seriously and survive in hermetically sealed buildings. The rest of the human race dies rather nastily...
One of its interesting features is that the artist used an illuminated letter at the start of each section, with the illumination actually relevant to the story. Most are T's. If anyone's interested they're below the cut
VERY hard to imagine anyone doing that today.
This one will probably go on line sooner or later, since it may be moderately important in the history of SF.