Scientific Instruments > Surveying Instruments

Brass Protractor By Elliott Bros w/ o Box

Item#: SSI973

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Brass Protractor By Elliott Bros w/ o Box - click to enlarge.

This is a folding arm 360 degree brass protractor 16 cm in diameter. Folding arm protractors are a more accurate drawing protractor then regular protractors, used by surveyors and mechanical engineers; it has a silvered vernier scale engraved around the circumference of the circle marked in half degree intervals. It is signed Elliott Bros London on the 5th spoke which has the clamp and screw gauges on its edge. The arms which have protracting pins at their ends for accurate plotting, fold in, so as to fit into the box. This type of protractor started being manufactured from around 1800. The original mahogany case is lined with blue velvet. The firm of Elliott Bros was founded in 1804 by William Elliott. In 1850 he formed a partnership with his sons, Frederick & Charles (Elliott & Sons) and the firm became known as Elliott & Sons, operating at 56 Strand, London. Whilst their father had specialized in drawing instruments, Elliott Bros offered a wide range of mathematical, optical, and philosophical apparatus. The firm began using the signature "Elliott Bros London" in 1873 and “Elliott Bros (London) Ltd” in 1916. During this time they were located at 449 Strand, London. Elliott Bros (London) Ltd appear to have discontinued producing surveying instruments around 1914-1918 and began to focus on developing electrical equipment