Silverston Vacu-Aerial” Flying Machine No. 2 of 1912 was also known as Dr. Rudolph Silverston’s Milwaukee Flying Machine No. 2. The photo caption reads “Pendulum system 120hp engine.”
According to historical reports, the good doctor had a school of aviation in Milwaukee, and persuaded a number of local investors to support construction of a machine of his devising, which seems to have been an early ducted fan type. The first was a failure; the second (shown) likewise refused to fly, whereupon Dr. Silverston left town with no forwarding address.
All Aero 