Clach an Tiompain , a Pictish symbol stone in Strathpeffer In the centuries after the departure of the Romans from Britain, there were four groups within the borders of what is now Scotland. In the east were the Picts, with kingdoms between the river Forth and Shetland. In the late 6th century the dominant force was the Kingdom of Fortriu , whose lands were centred on Strathearn and Menteith and who raided along the eastern coast into modern England. These missions tended to found monastic institutions and collegiate churches that served large areas. Origins of the Kingdom of Alba Conversion to Christianity may have speeded a long term process of gaelicisation of the Pictish kingdoms, which adopted Gaelic language and customs.
Fashion in the Middle Ages, 14th Century.
Dutch Revolt - Wikipedia
Physical explanation[ edit ] Rays of light travel in straight lines and change when they are reflected and partly absorbed by an object, retaining information about the color and brightness of the surface of that object. Lit objects reflect rays of light in all directions. A small enough opening in a screen only lets through rays that travel directly from different points in the scene on the other side and these rays form an image of that scene when they are collected on a surface opposite the opening. In simple terms, the way your retina sees a specific image through your eye is vertically switched to the object you see and how pieces in your brain are shown to switch that object right-side up to the way you see normally The human eye as well as those of other animals including birds, fish, reptiles etc. Technology[ edit ] A diagram of a camera obscura with an upright projected image at the top. A camera obscura device consists of a box, tent or room with a small hole in one side. Light from an external scene passes through the hole and strikes a surface inside, where the scene is reproduced, inverted thus upside-down and reversed left to right , but with color and perspective preserved.
Lists of Dutch inventions and discoveries
However, much has happened since it went up, including the Blogger outage. Scroll down for a report on that. More new posts will be added below this one. The essay below is the conclusion of the ninth part in a series by Takuan Seiyo.