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Agrandisseur de vere 5044/16/2023 The L-shaped roller bearings fit into the corresponding L-shaped slots in the back of each head. Depending on the age of the 504 chassis there will be either a pair of silver L-shaped roller bearings sticking out the back of the CHASSIS (early) and there may/may not be a deep V-profile groove running vertically down the uppermost rear part of the chassis as well. The heads mount in the same way (sorry, no pics for you). The stand alone blower solution eliminates any vibration issue that may occur if the fans in the head wear out and start to get out of balance. The early 504 dichromat (Mk III I think) heads used a stand-alone blower delivering air to the lamps through a large duct rather than a pair of small balanced fans in the head itself (Mk IV and V). Exposure times can be quite short because it is an efficient design.negative buckling might not be an issue. The condensers will absorb some of the heat radiated towards the negative, while some of it will rise up by convection and out of the top of the lamphouse (it is passively vented rather than fan cooled). The Varicon uses a mains voltage photocrescenta lamp, usually 150W.
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