Keywords: Houghton EC75.So883.785t - title.jpg en Title page from A treatise upon aerostatic machines containing rules for calculating their powers of ascension 1785 by John Southern Cropped and slightly edited for color and brightness/contrast Full scan of book http //pds lib harvard edu/pds/view/45545529 EC75 So883 785t Houghton Library Harvard University 1785 http //pds lib harvard edu/pds/view/45545529 EC75 So883 785t Houghton Library Harvard University<br /> institution Houghton Library John Southern author This is a media file that Houghton Library believes to be in the public domain of the United States This applies to a work published before January 1 1923 or the unpublished work of an author who died more than 70 years ago Houghton Library and Harvard University claim no rights in this photographic reproduction of the work and the image is free to download and reproduce for any use commercial or non-commercial without any further permission required We request that where these media files are used the Houghton Library is credited as the source of the materials Please include this citation EC75 So883 785t Houghton Library Harvard University as its source In the event that any of the media files infringes your rights or the rights of any third parties or file is not properly identified or acknowledged we would like to hear from you so we may make any necessary alterations In this event please contact Houghton_Library harvard edu other versions Custom license marker 2014 11 04 PD-old-100 1785 engravings John Southern engineer Media in the Houghton Library Harvard University Uploaded with UploadWizard |