Submarine

A submarine is a special type of ship able to navigate under water in addition to the surface, thanks to a variable buoyancy system. Used extensively for the first time in the First World War, now part of all major armed

Steam Engine

Steam engines are used by us in many of our activities but we are not aware of this, but not many people able to define exactly what is really a steam engine. We understand this artifact, which is an external combustion engine, capable of transforming energy of a certain amount of water vapor, making a kinetic or mechanical work.

Sewing Machine

Sewing machine is a mechanical or electromechanical device for attaching fabric using thread. Sewing machines make a stitch feature, usually using two threads although machines exist that use one, three, four or more.

Sewing machines can make a variety of straight stitches or patterns. Include means to pull, hold and move the fabric under the sewing needle to form the stitch pattern. Most home sewing machines and some industrial use a two thread stitch called topstitching. Most industrial sewing machines using a looping stitch produced by a machine called a serger. Some old sewing machines produce ridges.

The mechanism for sliding the fabric can be a simple guide to work or be controlled by standards (eg, Jacquard type.) Some machines can create embroidery-type stitches.

Bicycle

The bike is a personal transport vehicle whose basic components are two wheels of equal diameter and usually arranged in line, a pedal-drive system, a metal box that gives the structure and integrates the components, handlebars for steering and a saddle to sit. The displacement is obtained by rotating the box with legs to the pedals through a chain turns a gear which in turn rotates the rear wheel on the pavement.

Telegraph

The telegraph is a telecommunication device for transmitting signals at a distance. The most widely used over the years has been the electric telegraph, but they have also used optical telegraphs different forms.

Telephone