The item explains how Philippe de Girard's invention works comparing it to Horace Hall's patent of 1814. There is no date but presumably it was made for the trial.
At center, inventor Leon F. Douglass poses with his submarine camera while aboard the Santa Rosa. He sits side-saddle on a bench. The base of the camera rests in front of him on the bench. A long tube extends vertically from the camera and out-of-frame. Leon F. Douglass holds onto the apparatus with both hands as he looks to camera. A deck of the Santa Rosa stretches across the background.
At center, inventor Leon F. Douglass stands on a set of stairs aboard the Santa Rosa. The stairs span 2 of the ship's decks. Leon F. Douglass stands midway up the steps and holds his invention, a submarine camera. The camera extends from the top of Leon F. Douglass' shoulder and down towards the lower deck.
Photo appears with article "Plane to Have Bird-like Wing: Construction Started Here on New Discovery; Tryout With Pilot Planned Within Two Months; Model Used in Tests Rides Against Strong Wind," Los Angeles Times, 6 Jul. 1930: A1.
Phillip Huyssen poses with an Ingo-bike, a type of eccentric-hub scooter he invented with his brother Prescott. Eccentric-hub scooters are powered by bouncing up and down on the platform to move the off-centered back wheel.