A UNIVERSAL MICROSCOPE AFTER BENJAMIN MARTIN BY CHADBURN BRO...

Hammer

£280

A UNIVERSAL MICROSCOPE AFTER BENJAMIN MARTIN BY CHADBURN BROTHERS, SHEFFIELD, CIRCA 1850

constructed in lacquered brass and signed on the folding foot as per title, 6in. tube with nose piece, platform and mirror -- 15in. (38cm.) high

Dr. Mill notes:

Alfred and Francis Wright Chadburn founded this firm in 1837 in Sheffield and were joined by Charles Henry Chadburn who opened a Liverpool branch in 1845. They were mentioned for the cheapness of their products at the 1851 exhibition and were given Prince Albert's Royal Warrant. They seem to have been primarily concerned with optics and produced lenses on a massive scale (mainly for spectacles) which they built into various instruments. An engraving of their showroom contains a microscope of this type in the centre.

This is clearly a form of microscope derived from designs by Martin, Shuttleworth, Adams and others with a single pillar arising directly from a flat tripod foot. Focussing is by moving the stage by means of a rack set into the flat rear face of the triangular pillar. Achromatic lenses appeared from the 1830s on - but not here. There are three simple lenses with an eye lens, a large field lens in the body join and a single objective lens, The long nose piece gives the appearance of an achromatic objective but the simple lens is attached to the end of it by a screw cap. No other lenses accessories or case are now present.

These 'primitive' features are not in some ways surprising. Similarly 'antique' designs were found in the simple drum microscopes which continued almost into the 20th century. They do contrast strangely with the sophisticated microscopes being produced by Ross, Powell and Lealand, Beck et alia from the 1840s on and the reason of course lies in the price. The advanced stands served both the professional market and the advanced and well heeled amateur. The simpler basic stands appealed to the recreational market.

Lacking box and accessories.