An axle is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearings or bushings are provided at the mounting points where the axle is supported.
A visual aid is something that supplements words with a picture, chart, or illustration. Looking at an image of the brain and the optic nerve as you read about it is a good example of a visual aid. It is a supplement to the words you're reading. Let's look at why you should use visual aids when you give a speech and the best ways to use them. Why Use Them. Imagine that you are going to present information to one of your classes.
Tips for Using Visual Aids. Stand to the side of the visual aid. Do not obscure the visual aid if at all possible. Traditionally, speakers have the visual aid on their left. Maintain eye contact. While the visual aid will be tempting to many speakers, the audience should still be their main focus.