| Three-metre level rods with scales on an invar ribbon, and 60-inch target bars for optical triangulation systems are calibrated using a long-bed Abbé comparator equipped with a laser interferometer. |
| Tooling materials include invar, steel, aluminium, reinforced silicone rubber, nickel, and carbon fibre. |
| Choosing a material with a low coefficient of thermal expansion, such as Invar, is one method for minimizing thermal drift. |
| Invar, an alloy containing 36 percent nickel, with the balance iron, is notable for its extremely small thermal expansion. |
| Aluminum is the most frequently used metal for structures, but in some cases stainless steels, titanium, or Invar may prove more advantageous. |
| Two mechanical designs, based on invar, have been constructed in the BIPM workshop for the realization of very compact lasers using a threemirror laser cavity for a selection mode. |
