• WordNet 3.6
    • n Invar an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments
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Century Dictionary and Cyclopedia
    • n Invar The tradename of an alloy of steel and nickel which, when made with 36.2 percent, nickel, has a coefficient of expansion for heat which is virtually zero: hence its name. It was discovered by Dr. Guillaume. Sometimes called Guillaume alloy, and also Sèvres alloy, from the fact that the investigation of its properties was made at Sèvres.
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In literature:

Anak had not thrown his spear, and Invar, who stood beside his hero, had likewise retained his weapon.
"B. C. 30,000" by Sterner St. Paul Meek
Invar pendulum rods are often made of steel with coefficients of expansion of about .0000012 linear per 1 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5" by Various
A chronick old bachelor iz invaribly ov the nuter gender, i don't care how mutch he may offer tew bet that it ain't so.
"The Complete Works of Josh Billings" by Henry W. Shaw

In science:

Arnowitt R and Deser S and Misner C 1961 “Coordinate invar iance and energy expressions in general relativity” Phys.
Close encounters of black holes
L INEAR INVAR IANCE : If one transforms the scores for either constraint by a positive linear function, then the solution should be subject to the same transformation.
Dialogue as Discourse: Controlling Global Properties of Scripted Dialogue
From the BUS overlay drawing (Figure 9) it appears that there is a print-through of the connections of the BUS with the Invar cone (the turnbuckles).
Evaluation of the ALMA Prototype Antennas
The OPT is a NRAO-designed refracting telescope composed of a 4 inch lens mounted within a rolled-Invar tube (Mangum (2004)).
Evaluation of the ALMA Prototype Antennas
L4: path length of the reflector = distance between the Invar cone/vertex hole and a point of the reflector surface, measured via the subreflector.
Evaluation of the ALMA Prototype Antennas