Which risk increases with timber bridges lacking regular Tarr Preservation?

💡 Explanation

Accelerated section rot increases because degradation of structural members induces weakening according to properties defined by wood. Timber is vulnerable to microbial attack in moist conditions on bridges promoting unchecked expansion and therefore collapse; rather than thermal stress alone controlling outcomes.

• Which outcome occurred using historical astrolabes on ships that sailed near the poles?
• Which risk increased during mass-production of Qin dynasty crossbow trigger mechanisms?
• Which outcome accelerated the spread of cast-iron crossbows?
• Which astronomical calculation was simplified by the use of the alidade on an astrolabe?
• Which phenomenon limited image quality projected by early 'camera obscura'?
• Which degradation mechanism limited the lifespan of early Mesopotamian bronze tools?