When it opened to vehi­cle traf­fic in May, 1937 the Gold­en Gate Bridge was the longest sus­pen­sion bridge in the world. Since then eight bridges have sur­passed it in length, but the icon­ic inter­na­tion­al orange span is still the most pho­tographed bridge in the world. This month marks the Gold­en Gate’s 75^th anniver­sary and the Cal­i­for­nia His­tor­i­cal Society’s exhib­it, A Wild Flight of the Imag­i­na­tion, cel­e­brates the event with a look at the bridge’s con­struc­tion. The exhib­it has also been made avail­able as a free eBook for the iPad, which includes his­toric pho­tographs by Ansel Adams and Dorothea Lange as well as a short film of bridge design­er Joseph Strauss speak­ing to a reporter dur­ing the bridge’s con­struc­tion. At the time, experts said that the Gold­en Gate strait’s fero­cious winds and strong, swirling cur­rents would make con­struc­tion impos­si­ble. But the design intro­duced deflec­tion the­o­ry, which uti­lizes a thin, flex­i­ble road­way and long cables that reduce struc­tur­al stress.

The inter­ac­tive app is accom­pa­nied by a musi­cal score—the open­ing selec­tion from com­pos­er Rob Kapilow’s Chrysopy­lae, Greek for “Gold­en Gate.” Ear­ly users of the eBook report­ed glitch­es with the app’s audio. The cul­prit may have been the side mute switch, which must be flipped off for the audio to work. Also, make sure your iPad’s vol­ume is up. Like the exhib­it in the society’s San Fran­cis­co muse­um, the app includes access to images of some 350 objects and ephemera relat­ed to the span’s con­struc­tion. Almost as nice as a walk across the bridge’s 1.7 miles, and not near­ly as windy.

Kate Rix writes about k‑12 instruc­tion and high­er ed.