Abstract

Among the first artefacts of aluminium exhibited at the Paris Exposition of 1855 were scientific instruments. France retained this lead, with her craftsmen employing the metal in balance-beams, telescopes, binoculars, sextants, and anemometer vanes. Within a few years instrument-makers in other countries took up the use of aluminium-bronze alloys, which offered greater strength and rigidity. These alloys served in the construction of various precision astronomical, surveying, and other instruments. Differing reports on aluminium, its alloys, and their qualities were largely due to uncritical acceptance of the metals and ignorance of their precise constitution. Trace impurities had marked effects on quality, and numerous patented alloys reached the market without metallurgical testing. Yet by the end of the nineteenth century, as these problems were being overcome and the metal became cheap, it fell from favour as a component of quality scientific instruments