While most of us are limited to the visible spectrum, people with a condition called aphakia possess ultraviolet vision. Aphakia is the lack of a lens, due to surgical removal for cataracts or congenital defects.
A railroad lantern and a railroad lamp are two different things. Lanterns were designed to be portable (i.e. carried) and were basically globes surrounded by a metal frame with a fuel source. When you think of a railroad worker swinging a signal, think lantern.
The steam engine was originally invented in England to pull water out of coal mines. For thousands of years, wood from local forests had been the main fuel in England, as well as the main material for shipbuilding and housing construction. By the end of the 17th century, however, few forests remained (Weightman 28-33).he steam engine was the energy behind the most advanced textile inventions, such as the spinning mule and the power loom. It symbolized the transition from human power in homes to machine power in factories. Moreover, the steam engine revolutionized transportation when it was applied to locomotives and ships.