The very good theme I installed six months ago was the Thesis themebut the standard installation does not include a header image auto rotation — something that is a standard for many WordPress themes.
History[ edit ] There probably existed quite a few other types of projectors than the examples described below, but evidence is scarce and reports are often unclear about their nature.
Spectators not always provided the details needed to differentiate between for instance a shadow play and a lantern projection. Many did not understand the nature of what they had seen and few had ever seen other comparable media. Projections were often presented or perceived as magic or even as religious experiences, with most projectionists unwilling to share their secrets.
Joseph Needham sums up some possible projection examples from China in his book series Science and Civilization in China  Prehistory to CE[ edit ] Main article: Shadow play usually does not involve a projection device, but can be seen as a first step in the development of projectors.
Camera obscura[ edit ] Principle of camera obscura: Camera obscura Projectors share a common history with cameras in the camera obscura. Camera obscura Latin for "dark room" is the natural optical phenomenon that occurs when an image of a scene at the other side of a screen or for instance a wall is projected through a small hole in that screen to form an inverted image left to right and upside down on a surface opposite to the opening.
The oldest known record of this principle is a description by Han Chinese philosopher Mozi ca. Mozi correctly asserted that the camera obscura image is inverted because light travels in straight lines from its source.
In the 11th century Arab physicist Ibn al-Haytham Alhazen described experiments with light through a small opening in a darkened room and realized that a smaller hole provided a sharper image. The use of a lens in the opening of a wall or closed window shutter of a darkened room has been traced back to circa The shared history of camera and projector basically split with the introduction of the magic lantern in the later half of the 17th century[ original research?
The camera obscura device would mostly live on as a drawing aid in the form of tents and boxes and was adapted into the photographic camera in the first decades of the 19th century. Chinese magic mirrors[ edit ] The oldest known objects that can project images are Chinese magic mirrors.
The mirrors were cast in bronze with a pattern embossed at the back and a mercury amalgam laid over the polished front. The pattern seen on the back of the mirror is seen in a projection when light is reflected from the polished front onto a wall or other surface.
No trace of the pattern can be discerned on the reflecting surface with the naked eye, but minute undulations on the surface are introduced during the manufacturing process and cause the reflected rays of light to form the pattern. A trotting horse lamp is a hexagonal, cubical or round lantern which on the inside has cut-out silhouettes attached to a shaft with a paper vane impeller on top, rotated by heated air rising from a lamp.
The silhouettes are projected on the thin paper sides of the lantern and appear to chase each other. In France similar lanterns were known as "lanterne vive" bright or living lantern in Medieval times and "lanterne tournante" since the 18th century. An early variation was described in by Jean Prevost in his small octavo book La Premiere partie des subtiles et plaisantes inventions.
In his "lanterne" cut-out figures of a small army were placed on wooden platform rotated by a cardboard propeller above a candle.
The figures cast their shadows on translucent, oiled paper on the outside of the lantern. He suggested to take special care that the figures look lively: According to Prevost barbers were skilled in this art and it was common to see these night lanterns in their shop windows.
A more common version had the figures, usually representing grotesque or devilish creatures, painted on a transparent strip. The strip was rotated inside a cylinder by a tin impeller above a candle.The images in the column on the left are from observatories, whilst those on the right are from the “Hubble Telescope“..
Apart from all the images being very similar (or identical), they are often composites of 3 or more pictures each captured through a separate light filter and then processed further.
On top of that, since NASA fake stars and obviously entire images of machines. The TeX showcase. This is the TeX showcase, edited by Gerben iridis-photo-restoration.com contains extreme examples of what you can do with TeX, the typesetting engine from Donald Knuth, world famous mathematician, computer scientist and above all well known for TeX.
I will try to keep this showcase small. For remarks on submissions, see at the end of this document. QRD Technical Overview. A QRD diffuser comprises wells of different depths, causing a mixture of phase shifts that diffuse reflected sound.
They are used to control reflections in the listening environment, particularly from rear walls and first-reflection points. Sep 08, · Rotate Images In Thesis.
Header image rotation for Thesis theme — M. Y. Lessons Learnt One of the very first things I want to do to the blog in the new year is to change its look, with a very simple twist — rotate the header image.
Click here to go back to the home page.. Introduction.
In this review paper I will be critically analysing a number of theories (and opinions) that golf instructors have arbitrarily promoted regarding the optimal biomechanical performance of spinal motion and pelvic motion in the full.