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Fortis Gallery

Available as Framed Photos, Photos, Wall Art and Gift Items

Choose from 26 pictures in our Fortis collection for your Wall Art or Photo Gift. Popular choices include Framed Photos, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature, 1683 Featured Fortis Print

Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature, 1683

Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature, 1683. Centre: 1) Athanor or Slow Harry'; 2) side chambers containing reagents; 3) glass receivers. Back: 5) furnace heating retort. Bottom: 7) long furnace. This plate shows the distillation of nitirc acid (also known as Aqua Fortis or Parting Acid) which was used in the refining and assaying of metals. From a 1683 English edition of Beschreibung allerfurnemisten mineralischen Ertzt by Lazarus Ercker. (Prague, 1574)

© Oxford Science Archive / Heritage-Images

Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature Featured Fortis Print

Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature

Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature. Centre: 1) Athanor or Slow Harry': 2) side chambers containing reagents: 3) glass receivers. Back: 5) furnace heating retort. Bottom: 7) Long furnace. This plate shows the distillation of nitirc acid (also known as Aqua Fortis or Parting Acid) which was used in the refining and assaying of metals. From 1683 English edition of Beschreibung allerfurnemisten mineralischen Ertzt, Lazarus Ercker, (Prague, 1574). Copperplate engraving

© Universal History Archive/Universal Images Group