Other than the internet itself, I've found two main sources that will allow you to prowl through their collections. The first is the legacy of Dr. Parks and Andy Parks which is called the Lafayette Foundation and is located in Denver, CO, the second is the
ED Ferko Collection of WW1 Photographs at the University of Texas in Dallas.
This is a sketch of a very young Jacobs. It is part of the Diary Collection on display at the Lafayette Foundation in Denver, CO USA. This is a truly wonderful collection with some really rare stuff, Jacobs' personal diary is just one of the treasures out there. Stop by and look into it, it’s worth its weight in gold. All time high ranking poster to the aerodrome Stephen Lawson is one of the main folks out there. If your are in Denver and miss it, you’ll never forgive yourself. The collection, if I am not mistaken, was put together by Andy Parks' father and grandfather and the sheer magnitude of artifacts is staggering. Look them up.
About the sketch itself; it was done by someone whose name I could not read from the work. If I am not mistaken it looked like a copy on poster type board. The image was held with the diary when I saw it, but I was not sure if it belonged to it originally.
The LaFayette foundation has a smallish collection of the personal artifacts of Joseph Jacobs including his war time diary, medals and casket drapes amongst other things. Of particular note is the diary.
The Ed Ferko Collection is actually multiple collections of photographs, engineering documents, factory photos and other goods pertaining to WW1 aviation. Quite literally this is the Indian Jones warehouse of WW1 aeroplane stuff. I went out there hoping to find a single picture of something and was faced with thousands of photographs I could not bear to leave behind. There may be as many as 1000 Fokker Triplane photos alone out there, that no one has ever seen on the internet before. Many of the photos are complete with negative plates. The staff is attempting to sort, categorize and scan the lot, but they are decades from being even half way through the effort. For now there are boxes of photo albums, with ownership/authorship indicated, and you simply have to start prowling through it.
Of particular interest to me when I first got there was the personal war time photo album of Jacobs,. Sadly there are no Fokker Triplane photos in the diary and surprisingly little photographic evidence of his aeroplanes. Such is the case with all of us, when we are the ones taking the photos, our self and our stuff rarely makes it into one of the photos. Still there are great photos in it of many things personal to the man.