Albert Ott

A sample of products from this maker can be found in the <i> Special Catalogue of the Collective Exhibition of Scientific Instruments and Appliances exhibited by the Deutsche Gesellschaft fuer Mechanik und Optik </i> for the World's Columbian Exposition, Chicago, 1893. Available in Google Books <a href="http://books.google.com/books?id=6NU4AAAAMAAJ&pg=PA54&lpg=PA54" target="_blank">here</a>.