According to the negative sleeve, the photographs in this group were taken in 1931. Key features of these images were nonexistent in 1931. Penguins were not exhibited at the San Diego Zoo until 1933. Alpha the Robot did not appear in the states until late 1934 and was a special attraction in San Diego during the California Pacific International Exposition (1935-1936). Based on this, it is most likely that the images were taken about 1935 during the exposition.
According to the negative sleeve, the photographs in this group were taken in 1931. Key features of these images were nonexistent in 1931. Penguins were not exhibited at the San Diego Zoo until 1933. Alpha the Robot did not appear in the states until late 1934 and was a special attraction in San Diego during the California Pacific International Exposition (1935-1936). Based on this, it is most likely that the images were taken about 1935 during the exposition.
According to the negative sleeve, the photographs in this group were taken in 1931. Key features of these images were nonexistent in 1931. Penguins were not exhibited at the San Diego Zoo until 1933. Alpha the Robot did not appear in the states until late 1934 and was a special attraction in San Diego during the California Pacific International Exposition (1935-1936). Based on this, it is most likely that the images were taken about 1935 during the exposition.
![Robot advertising for Alpha the Robot while walking through the California Pacific International Exposition near the Cafe of the World, San Diego, [about 1935]](https://iiif.library.ucla.edu/iiif/2/ark%3A%2F21198%2Fzz002hsh3d/full/!200,200/0/default.jpg)
![Penguins stand at attention and await their feeding at the San Diego Zoo, San Diego, [about 1935]](https://iiif.library.ucla.edu/iiif/2/ark%3A%2F21198%2Fzz002hsh2w/full/!200,200/0/default.jpg)
![Penguins stand in their enclosure at the San Diego Zoo, San Diego, [about 1935]](https://iiif.library.ucla.edu/iiif/2/ark%3A%2F21198%2Fzz002hsh4x/full/!200,200/0/default.jpg)