Definition of "tungsten"

So far they have built and used a prototype robot to make millionth-of-a-meter scratches in aluminum with a fine tungsten needle.

1990 April 7, Ivan Amato, “Getting a feel for atoms: 'magic wrist' takes scientists into a new sensory realm”, in Science News‎

We have several business houses where tungstens are used as window lights only, and find that in nearly every one the wiring was arranged to get more light, leaving the consumption about the same.

1909, E. A. Baily, “The Tungsten Lamp Situation in Various Cities”, in Electrical Age, volume XL, number 10, page 262

Lighting was unimaginative for the standard stock with naked tungsten filament bulbs and metal reflectors. However, all compartments had individual reading lights above the seats with attractive glass shades.

1979 August, Graham Burtenshaw, Michael S. Welch, “O.V.S. Bulleid's SR loco-hauled coaches - 1”, in Railway World, page 398

We apprehend that this is not the acid of a calx ponderoſa, but rather a diſtinct acid conjoined to common calcareous earth, ſince, in fact, in another place, § 97, the tungſten is mentioned as a calx ſaturated with a peculiar acid, perhaps of a metallic nature, for which the author himſelf refers us to the above § 33, and ſeems to think it the ſame as the acid there mentioned.

1783, “[Review of] Outlines of Mineralogy”, in Monthly Review, volume LXX, number VII, page 47