A William Ainsworth & Sons of Denver, Colorado surveying transit in a travel box, used to measure stadia. Similar instruments can be found at the following links: https://americanhistory.si.edu/collections/nmah_745873 and https://www.antiqbuyer.com/past-sale-archives/surveying/surveying-transit.htm. Dimensions: The instrument itself is 14-inches high on a 7 x 9 base. The travel box is 15H x 10.25W x 8D inches Processing and shipping within the continental U.S. $50.00 plus 1.5% replacement cost insurance. Discounts given on combined lot shipping. Good. The box shows signs of wear and scratching. The instrument is dirty with minor wear. Please see photos.