Photographic installation consisting of of 3 elements (from left to right): - Zeppelin L30, 1917. Original photograph printed on gelatin silver. Measures: 1 37/64 x 2 23/64 in. Assembly after passepartout and black wooden frame. Measures: 10 5/8 x 8 21/32 x 19/32 in. - September 1, 1939 (ZSL Annual Report). Photography made in Ultrachrome printing on 100 grs. rice paper. Hahnemuhle. Measures: 11 13/16 x 7 7/8 in. Assembly after white passepartout and natural wood frame. Measures: 17 21/64 x 12 19/32 x 19/32 in. - Engine mechanics working on a Zeppelin on ground, 1917. Original photograph printed on gelatin silver. Measures: 1 37/64 x 2 23/64 in. Assembly after passepartout and black wooden frame. Measures: 10 5/8 x 8 21/32 x 19/32 in. Set: 17 21/64 x 30 45/64 x 19/32 in.