THE DEVELOPMENT OF ARMOUR 
587 
lower douche of the Tresidder chilling apparatus. The upper douche, Face har- 
suspended from a carriage running on overhead rails, is then immediate- Sheffield^ 
1 y advanced, and makes an automatic water-tight connection with the 
pump delivery. A patent indicating apparatus is then adjusted on 
each of the long edges of the plate, by which the change of form 
during the whole chilling operation is automatically and instantaneous¬ 
ly recorded. This does not take many seconds, andjmmediately it is 
