A REVIEW OF CLOSE-RANGE ENGINEERING PHOTOGRAMMETRY 61 
  
Fıc. 2 & 3. Examples of precast concrete 
panels which were photographed and con- 
toured in order to assess flatness. 
  
      
FiG.4. Abuildingat Aldershot, Hampshire 
which had just been erected using precast 
panels. 
problems in the building industry (Atkinson 
and Newton, 1968). 
Huby's Tower, Fountains Abbey (Figure 6) 
is a ruin, approximately 47 m high and 18.5 m 
wide at the base. It was built about 1500 and 
has been in a ruinous condition since the 
dissolution of the monasteries by King 
Henry VIII in 1539. The four walls have no 
internal or external structural support and a 
  
FiG. 5. Sample measurements of the build- 
ing (Fig. 4) which show departures from the 
vertical in the YZ plane. The depth(Z) scale is 
in mm at 1:1. The height (Y) element is dia- 
grammatic. 
gradual movement or settling of the tower, 
over a long period, produced numerous frac- 
tures in the fabric. The Ministry of Public 
Building and Works (now a part of the De- 
partment of the Environment) were anxious 
to strengthen the tower against further struc- 
tural deterioration or possible failure and, in 
order to assess the position and to decide 
upon remedial measures, large scale draw- 
ings of the tower elevations were needed, 
showing all masonry joins and fractures. Plot- 
ting at 1:50 scale conveniently allowed all 
joins to be shown. Small fractures could, 
however, only be represented by a single line 
while both sides of larger gaps could be plot- 
ted. At first sight, the fractures appear to 
have been exaggerated or drawn more heav- 
ily but this appearance derives either from 
the double line representing both sides ofthe 
fracture or from the irregular pattern con- 
trasted with the regular courses of stonework. 
A full account of this survey was given to the 
symposium of ISP Commission V in Paris 
(Atkinson and Proctor, 1970). 
Model structures have been subject to