伦敦交通调查的结构工程意义。由O. A. Kere提出的讨论

在开放卷筒桁架的设计中，通常在以下假设上计算轴向应力：（1）所有构件都是直的，在接头处旋转，这被认为是平滑的铰链;（2）所有关节都躺在成员的质心轴线;（3）在关节上施加包括成员重量的所有载荷，包括在关节上。H.K.Bandyopadhyay

今年的quatercentenary G的诞生alileo Galilei, from whom it can reasonably be said that all our modern developments in astronomy originate. Galileo did not invent the telescope-a distinction which must probably be credited to the Dutch spectacle-maker Hans Lippershey, who sought a patent in 1608 for his instrument of two spectacle lenses through which he could see the church steeple magnified-but Galileo first used the telescope to study the heavens. In 1609 with lenses 2 1/4 in. in diameter mounted in a 49 in. paper tube he discovered the mountains on the moon, the spots onthe sun, the moons of Jupiter and thereby began the revolution in our outlook on the universe which continues today with ever-increasing vigour. ‘At length, by sparing neither labour nor expense, I succeeded in constructing for myself an instrument so superior that objects seen through it appeared magnified nearly a thousand times, and more than thirty times nearer than if viewed by the natural powers of sight alone.’ Galileo died in 1642 longing for a better telescope which would gather ‘more light’. Sir Bernard Lovell

摩天大楼被称为独特的美国建筑。这可能是因为美国尤其是其两个主要城市的情况。詹姆斯鲁曼