This harvestmen spider drawing is actually quite bigger than these arachnids are in real life. They generally only grow from 1-7 mm. To put that in perspective, one mm is about the thickness of the American 10 cent coin. So, even though this is a bit of a small drawing, it is more than likely larger than life-sized.
These spiders have elongated bodies and long legs and eyes. They are found in nature in an area that spans from India to New Guinea. The Stylocellus sumatranus is the spider shown here. They are members of an order which also includes daddy longlegs.
He looks a bit odd for me with the two body segments creating a single silhouette but this harvestmen spider drawing is a simple black and white illustration that could easily be incorporated into a larger work. It appeared in the 1911 Encyclopedia; an edition classified as public domain in most of the world.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.