vee Photo Tower Triangulation Report Reproduced from the holdings of the National Archives Pacific Southwest Region A report wes issued on May 18, 1951, including the relation of the photo tower to the Zero points. The values are listed as computed from the control network and also from check computations based on observations made at the structure sites. This report is inoluded. Adjusted Data Adjusting of the expanded soheme has been completed, and the adjusted values are included in this report. The value of the length of each line is independent of the route followed in the oomputation,. All observations, inoluding the cheok observations at the structure sites, were evaluated and used in the adjustments. While this data varies from the values given in the photo tower triangulation report, the differences are small and assure that the values given in this report are within requirements. In the interests of economy, these computations are not included in this report. The sketches included record the adjusted values determining the inter-relation of the various stations. The computations and field notes will be a part of the permanent survey records at the jobsite. (37