and it was not until the middle of May 1949 that a complete four-man party and a computer-—draftsman was available, In the interim, the department head alternated as chief of party and computer-draftsman, By late fall of 1949, two full parties were available and a third was on requisition. Later, additional personnel were requisitioned, until the department at maximm consisted of a department head, two senior engineers in charge of forces at Engebi and Biijiri, two computers, one draftsman, and twentyfour field men operating as six or seven parties as required. The following Table gives a resume by months of the number of survey personnel at the Jobsite. TABLE 5, S—1, MONTHLY TOTAL OF SURVEY PERSONNEL 1249 1950 1951 Jan, 11 Jan. 30 30 Feb, 2 Feb. me Feb. Mar, 3 Mar. 8 Mar. Apr. 4 Apr. i Apr. 20 May 6 May 4 May 13 June 6 June 17 June 8 July 6 July 19 Aug. 7 Aug. 25 Sept. 7 Sept. 30 Oct. 10 Oct. 29 Nov. 10 Nov. 30 Dec, 11 Dec. 30 | 22 EQUIPMENT AND SUPPLIES Early in the Project, some difficulties were experienced with equipment because at times it was necessary to substitute makes other than those ordered, and because often, as with plumb bob points and red targets, these pieces of equipment were not interchangeable. Later these difficulties were avoided by the inclusion of instructions on requisitions, prohibiting substitutions. 5a7k