Signed on the back collar, ‘Armstrong, Manchester’, measuring 54″ ( 137 cms ) extended with a 3 inch objective lens. It has an adjustable tripod giving an extended height to 70″ ( 180 cms ). Magnification is 40 x. In good condition throughout giving a fine sharp image when viewing.
Thomas Armstrong & Brother Ltd worked from 1825 – 1868. In 1877 they were appointed official opticians to the Manchester Royal Eye Hospital and supplied optical equipment to many government departments. In 1868 they were taken over by Dollond & Aitchison, the opticians.
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