Summary

This book, written by Nobel laureate Charles Édouard Guillaume, presents the central thesis that nickel-alloyed steels possess unique physical properties—particularly low thermal expansion and high elasticity—that make them indispensable for precision instruments and industrial applications. Guillaume, who discovered the nickel-iron alloy Invar (36% nickel) in 1896, systematically documents how varying nickel content alters steel’s coefficient of expansion, magnetic permeability, and mechanical strength. The work details specific alloys like Invar and Elinvar, explaining their roles in eliminating thermal errors in clocks, geodetic surveying equipment, and scientific apparatus. A reader takes away a technical understanding of how nickel additions transform steel’s behavior, enabling the construction of devices requiring dimensional stability across temperature changes.

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Key concepts

Invar — A nickel-iron alloy (36% Ni) with an extremely low coefficient of thermal expansion, used for precision measurement tools and clock pendulums.
Elinvar — A nickel-iron-chromium alloy with constant elasticity over a wide temperature range, critical for hairsprings in chronometers.
Coefficient of thermal expansion — The rate at which a material expands per degree temperature change, which nickel alloys can reduce to near zero.
Martensitic transformation — A phase change in steel that nickel suppresses or modifies, affecting hardness and magnetic properties.
Magnetic permeability — The ability of nickel alloys to conduct magnetic flux, which varies with nickel content and heat treatment.
Age hardening — A heat treatment process that increases the strength and stability of nickel steels through precipitation of intermetallic compounds.