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Inventions

The stethoscope is an acoustic medical device used for listening the internal sounds of the body. It can be used to listen to lung, heart, and intestines as well as blood flow in the arteries. With a sphygmomanometer it can be used to measure blood pre...

A safety pin, a variation of the regular pin, is a simple fastening device which includes a simple spring mechanism and a clasp. The clasp covers the end of the pin to protect the user as well as forms a closed loop fastening the pin to whatever it is ...

A kaleidoscope, a tube of mirrors containing looks colored objects such as bead and pebbles, is used by the viewer looking in one end while light enters the other end. Sir David Brewster invented the Kaleidoscope and also coined the term. The term tran...

A gas stove is a cooking device which uses natural gas, propane, butane, Liquefied petroleum gas or other flammable gas as a fuel source. Since the gas pipe network was slow to develop, the success of the gas stove on a commercial level took some ti...

An electromagnet, a magnet whose magnetic field is produced by the flow of electric current, works until the electric current ceases. The magnetic field in a simple electromagnet is created by a wire passing through it with an electric current. The str...

The Braille system is a method that is widely used by blind people to read and write. It was devised in 1821 by Louis Braille, a blind Frenchman. The Braille characters are made up of six dot positions arranged in a rectangle containing two columns of ...

Bifocals are eyeglasses, commonly prescribed for presbyopia, with two distinct optical powers. Although there are arguments against him, Benjamin Franklin is generally credited with the invention of bifocals. After a correspondence between George W...

A barometer is an instrument that measures atmospheric pressure. The barometer measures pressure exerted by the atmosphere using water, air, or mercury. Through measuring the pressure one can forecast short term weather changes. Evangelista Torrice...

An adding machine, a type of calculator, is specialized for bookkeeping calculations. Calculating machines in the US are built to read in dollars and cents and were commonly found in offices. However, starting around 1985, computers started to replace ...

The toothbrush, consisting of a head of tightly clustered bristles mounted on a handle, is a tool used to clean the teeth and gums. The long handle allows for cleaning of hard-to-reach areas of the mouth. Usually toothpaste is used with the toothbrush ...

A planisphere is a star chart analog, adjustable to display the visible stars for any time or and date, consisting of two adjustable disks that rotate on a common pivot. The Planisphere was pre-dated by the astrolabe; however, the planisphere was first...

A pencil, containing a solid pigment core within a protective casing, is a common writing implement or art medium. Having a case keeps the pigment from breaking as well as from marking the user's hand. Pencils differ from pens because they leave mar...

A magnifying glass is a convex lens, usually mounted in a frame with a handle, which is used to produce a magnified image of an object. The glass works by creating a magnified virtual image of an object behind the lens. However, the distance between th...

Unlike its predecessor, the dip pen, the fountain pen holds its ink in a internal reservoir which is drawn through a feed to the nib by way of gravity and capillary action. Due to its way of operating the fountain pen requires little to no pressure to ...

An astronomical clock is a clock with special mechanisms and dials to display astronomical information. This information can include everything from the relative position of the sun and the moon to major planets to zodiacal constellations. The term...