To take a series of photographs of a procession, the camera should be directed up the road so that the proession is shown approaching.' Do not attempt to take the procession broadside on, as the exposure will need to be much more rapid owing to the movement appearing far more noticeable. The most rapid plates, Cadett "Lightning" or Ilford Special Rapid, should be used. The light varies so that it is practically impossible to say what exposure to give. Much will also depend upon the surroundings, direction of light, and the character of the procession - that is to say, whether the clothing of the processionists is dark or light. Experienced photographers usually endeavour to make a couple of trial exposures on the crowd a little before the event; by developing the plates at once they are enabled to get an idea of the exposure required. For the trial exposure use full aperture, and let the shutter work as quickly as possible. Develop one plate first and make a print: from the result it may be possible to suggest how the subsequent prints may be improved. Two or more cameras clamped to the window frame should be used.

They should be focussed before the procession arrives.