The function of an overhead projector is to show information on a screen using transparencies. Everything on the transparency had to be first printed backwards so that it would show on the screen in the right order.
Overhead projector replacement bulbs will definitely be sold somewhere on eBay or alternatively you could ask the local secondary school or college for help.
A Data Projector (referred to as Digital Projector) is a projector that gets its image from a Digital Source, such as VGA (computer), RCA (the most common A/V input), S-Video (another form of video input), and some others. These projectors are most commonly used along with DLP or LCD Technology.An Overhead Projector is an older style of projection, common in Education (Schools). These projectors are totally manual and require you to put a transparent image onto glass to project the image overhead.
One can buy a used overhead projector from eBay where there are many listed for sales in various conditions. They can also be purchased second hand from Amazon Marketplace.
An overhead projector is used to project an image of a transparency onto a wall or screen by means of an overhead mirror. There are also "slide projectors" that are used to display photographic slides on a wall or screen. A "projector" or "digital projector" would be used similar to a computer monitor or a television screen that would display an inputted image from a variety of sources (blu-ray player, computer, laptop, dvd players, game console, etc.). In the case of a projector the image is projected with the help of a light apparatus shining through a small silicon ship and projected through a lens to create an image on your wall or projector screen.
You don't need a slide projector or an overhead projector.
The overhead projector was invented in the 1960's.
The function of an overhead projector is to show information on a screen using transparencies. Everything on the transparency had to be first printed backwards so that it would show on the screen in the right order.
Some disadvantages of using an overhead projector include limited mobility due to being tethered to a power source and needing a flat surface to project onto, potential blurry projections if not properly focused, and the need for transparency sheets which can be costly and environmentally unfriendly.
My guess is that with LCD and DLP projector coming down in price, we will be seeing less and less of the overhead. When a video projector is used with an interactive whiteboard or tablet the possibilities are limitless.
projectionist
retroproyector
The function of an overhead projector is to show information on a screen using transparencies. Everything on the transparency had to be first printed backwards so that it would show on the screen in the right order.
Using projector can look neat and professional. Masking way can be used to hide the content that you haven't say them. Then you can reveal one piece of information at a time when you talk about it.
As high tech electronics are becoming more popular these days, the use of overhead projectors have deteriorated. More people are using "Smart" boards or "E" boards. The use of overhead projectors are slim to none.
This is referred to as an opaque overhead projector, or sometimes simply as an "opaque projector." This is in contrast to the regular overhead projector which must have transparencies to project, an opaque projector can project an image of opaque objects such as the paper pages of a book.
The only real similarity that I can think of is they both project images onto a wall or projector screen.