Vintage 1950's Nivarox Print Ad Short-Sleeve Unisex T-Shirt
A truly unique Special Edition Horological T-Shirt featuring a print ad from the 1950's by the Nivarox hairspring company. These are high resolution scans of an original advertisement that can be found at Roldorf& Co Gastown.
The NIVAROX Alloy:
As a trade name, Nivarox is a German acronym for "Nicht variabel oxydfest" (G.) or "Non-Variable Non-Oxidizing" (E.). The Nivarox alloy is a nickel iron alloy used mainly in the watch industry for hairsprings for balance wheels, but also in other micro-machine industries and in certain medical equipment and surgical instruments, in the same category as Elinvar, Ni-Span, Vibralloy, and other similar alloys. The "non-variable" refers to the alloy's most notable property: that it has a low temperature coefficient of elasticity; its elasticity does not change much with temperature. There are several versions of the Nivarox alloy depending upon the intended application: Nivarox-CT, but also with suffixes CTC, M, W. Chemical compositions vary in wt% as follows for all Nivarox alloys : Iron as balance, a wide variation in nickel between 30-40%, beryllium 0.7-1%, some versions have molybdenum at 6-9% while others have instead chromium 8%, titanium is present in some compositions at 1%, manganese at 0.7-0.8%, silicon 0.1-0.2% and carbon in traces up to 0.2%. A typical composition would be for the early version Nivarox-CT (by wt %) : Fe 54%, Ni 38%, Cr 8%, Ti 1%, Si 0.2%, Mn 0.8%, Be 0.9%, C < 0.1%.
When used for critical watch components, the alloy reduces errors due to temperature variation. Hairsprings made of this alloy have a spring constant which does not vary with temperature, allowing the watch's balance wheel, its timekeeping element, to keep better time. Along with the earlier alloy Elinvar, this alloy made obsolete the expensive compensation balance used in precision timepieces in the 19th century. Nivarox springs are now used by most watchmakers worldwide, with a global market share of 90%. The alloys also see limited use for specific components of sensitive scientific instruments.
• 100% combed and ring-spun cotton (Heather colors contain polyester)
• Ash color is 99% combed and ring-spun cotton, 1% polyester
• Heather colors are 52% combed and ring-spun cotton, 48% polyester
• Athletic and Black Heather are 90% combed and ring-spun cotton, 10% polyester
• Heather Prism colors are 99% combed and ring-spun cotton, 1% polyester
• Fabric weight: 4.2 oz (142 g/m2)
• Pre-shrunk fabric
• Shoulder-to-shoulder taping
|Width (inches)||16 ½||18||20||22||24||26|