Guard bricks

I thanked the guard and walked downstairs to the sub-basement of Crellin Hall. An insulated chest containing bricks of Dry Ice stood by the elevator, next to a stack of cardboard boxes. I selected a box, put on the... 

The uranium reactor was built on a squash court of the university (and it was here that the guards donned discarded raccoon coats to protect themselves from the cold). Dubbed CP-1 (Chicago pile number 1), it was called an atomic pile because it was just that The reactor consisted of a pile of containers of uranium oxide interspersed with graphite bricks. There was a neutron source at the bottom to initiate the reaction, and neutron-absorbing cadmium rods could be inserted for control. Fermi s group demonstrated the feasibility of a uranium chain reaction by the end of 1942. 

With all scaffolds, brick guards and debris netting should be used to prevent materials and equipment falling to the ground. 

Is additional protection such as wire mesh brick guards used where appropriate ... 

The ancient Romans made extensive use of concrete. The oldest siuv iving concrete structure is the Temple of Vesta, built in Tivoli during the first century BC. Other examples are the brick-faced concrete walls of the Camp of the Praetorian Guard, built by Sejanus in AD 21-23, the octagonal domed fountain hall of Nero s Golden House (AD 64r- ), and Hadrian s Pantheon of about AD 118-128, whose solid concrete dome is 43.2 m in diameter and 1.5 m thick and is supported by 6 m thick walls of brick-faced concrete. 

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