Vitrite

Vitrite, also known as foam glass, is a very low fusing point black glass mainly used for the insulation base of electric lamps. It used to be made by the Vitrite Company.

Process

To make the electric lamp, molten vitrite is poured into the shell up to a height of approximately a quarter inch (6 millimeters). A plunger is brought down to force the plastic glass into shape and fix the contacts.

Composition

Vitrite is referred to as glass but in fact it is an enamel which contains a high proportion of lead (II) oxide to give fluidity, and considerable quantities of manganoc to produce a black colour.

References

List of free and open-source software packages

This is a list of free and open-source software packages, computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software; the GNU project in particular objects to their works being referred to as open-source. For more information about the philosophical background for open-source software, see free software movement and Open Source Initiative. However, nearly all software meeting the Free Software Definition also meets the Open Source Definition and vice versa. A small fraction of the software that meets either definition is listed here.

Some of the open-source applications are also the basis of commercial products, shown in the List of commercial open-source applications and services.

Applied fields

Artificial intelligence