Problems with doming were addressed through the use of invar shadow masks that were mechanically robust and attached to the tube using a strong metal frame.
22.
A balance wheel of invar with a spring of elinvar was almost unaffected by temperature changes, so it replaced the complicated temperature-compensated balance.
23.
The Invar 9M119M and Invar 9M119M1 ( Invar-M ) are fired from a 125mm gun, like a shell, but operate like a guided missile.
24.
The Invar 9M119M and Invar 9M119M1 ( Invar-M ) are fired from a 125mm gun, like a shell, but operate like a guided missile.
25.
The Invar 9M119M and Invar 9M119M1 ( Invar-M ) are fired from a 125mm gun, like a shell, but operate like a guided missile.
26.
The name " Invar " comes from the word " invariable ", referring to its relative lack of expansion or contraction with temperature changes.
27.
Invar has a near-zero coefficient of thermal expansion, making it useful in constructing precision instruments whose dimensions need to remain constant in spite of varying temperature.
28.
All the iron-rich face-centered cubic Fe Ni alloys show Invar anomalies in their measured thermal and magnetic properties that evolve continuously in intensity with varying alloy composition.
29.
This pattern, built a couple of meters wide out of temperature-invariant steel invar, was used to keep the trains running on time in France before World War I.
30.
Common grades of Invar have a coefficient of thermal expansion ( denoted ?, and measured between 20 �C and 100 �C ) of about 1.2 ?10 " 6 creep.
