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S-IVB tank skins, the basic structural walls of this rocket stage, are milled on the inside in a wafflelike pattern to reduce weight while retaining most of the structural strength

 

the dome of the tank is being fitted with gores before welding

 

the two dome sections of the S-IVB's common bulkhead are being precisely fitted before insulation is applied between them

the Douglas Airplane Co. facility at Huntington Beach, California, is fabricating and assembling the S-IVB stages

major structural components of the S-IVB; at upper left is a complete hydrogen-oxygen tank; in the right foreground a straightsided Saturn IB interstage is flanked by a pair of aft skirts, with a forward skirt to the rear

 

Production in full swing: in towers at right and center, stages are being checked before shipment to Sacramento for firing tests; in the left tower, a tank section is being cleaned before insulation is applied; in lower right, a tank is being given its final interior work and the completed tank at left is about to be hoisted into the tower from which the photos were taken

 

The intricate job of applying insulation to the interior of the liquid hydrogen tank proceeds, as another individually numbered insulation tile comes off the conveyor belt.

 

A new S-IVB stage rolls out of the production facility, on its way to firing test. The white sphere is the combination helium-hydrogen start tank for the J-2 engine; the other tank contain helium for pressurization

An S-IVB stage is hoisted into the Beta test stand in Sacramento for the acceptance firing test.

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