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.
Making the world better, one answer at a time. Steam engines were the first engine type to see widespread use. They were first invented by Thomas Newcomen in 1705, and James Watt (who we remember each time we talk about 60-watt light bulbs and the such) made big improvements to steam engines in 1769. When the valve opens the cylinder to release its steam exhaust, the steam escapes under a great deal of pressure and makes a choo! sound as it exits. 2  When the train is first starting, the piston is moving very slowly, but then as the train starts rolling the piston gains speed. 3  The effect of this is the Choo.....