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CARTOGRAPHICAL SERVICES (SOUTHAMPTON) LTD 
This firm, established ten years ago, to undertake air and ground surveys, 
has during the period under review flown 250 km?, and plotted and produced 
25 000 km? of mapping mainly at 1:500 and 1:1250. The company recently 
acquired the premises and the major part of the equipment of Precise Surveys 
Lid at Worcester, and after some re-organisation this is now operating to its 
full capacity. Equipment now in use includes two reseau cameras with 
Aviogon lenses, seven Thompson-Watts plotters, and one Wild B8. Automatic 
recording equipment is in use on two of the plotters. The company has recently 
formed two new companies - Cartographic Engineering Ltd. concerned with the 
manufacture of photogrammetric instruments; and Surveying Training Ltd. 
concerned with teaching, whose activities are reported in the appropriate 
sections of this report. 
CENTRAL ELECTRICITY GENERATING BOARD 
The CEGB has continued the work mentioned in the 1968 National Report. 
About 2200 km of transmission time route has been surveyed, and some larger 
areas, to assist in the selection of substation sites. 
Detailed surveys of up to 2500 metre diameter have been carried out 
enabling the research laboratories to produce topographical models centred 
around a specific feature for wind tunnel testing. This has entailed ground 
survey, site verification, machine plotting and photographic enlargement to the 
model scale of 1:250 to 1:500. 
DIRECTORATE OF MILITARY SURVEY 
The Directorate of Military Survey, Ministry of Defence, has continued to 
use photogrammetric methods to map new areas, or to revise and update 
existing mapping, in support of operational or training requirements. The 
methods used varied considerably in complexity and sophistication according 
to the availability of control and photography, and according to production 
schedules and the required accuracy and mapping scales. 
Photomaps of towns were prepared from rectified mosaics based on slotted 
template laydowns, the final productions being multicoloured, with photographic 
images printed in two or three colours to differentiate between different surface 
features, and cartographic enhancement of important cultural details such as 
roads, significant buildings, and so on. Slotted emplate laydowns were used 
for the control of graphical plots for small scale mapping of sparsely 
populated areas. Full analytical, or independant model methods were used for 
control for medium scale 1:50 000 original mapping, often using sparse and 
inadequate control. Plotting at the medium scales was generally on Wild B8, 
but use has been made of Zeiss Stereotopes and multiplex. A total of about 
400 000 km’ has been surveyed. 
DIRECTORATE OF OVERSEAS SURVEYS 
The Directorate of Overseas Surveys, part of the Overseas Development 
Administration of the Foreign and Commonwealth Office, assists developing 
countries overseas in basic survey and mapping. During the period under 
review it has produced basic topographic mapping from air photography for 39