1.013

dc.creator	Powell & Lealand.
dc.date.accessioned	2012-02-07T13:52:46Z
dc.date.available	2012-02-07T13:52:46Z
dc.date.created	About 1842.
dc.date.issued	2012-02-07
dc.description.abstract	This instrument is one of the earlier achromatic microscopes produced by Powell & Lealand shortly after they formed their partnership in 1841. The instrument is supported by a double pillar and a flat tripod. The body-tube rests on the grooved limb, the coarse adjustment being by a rack-and-pinion system. The body and the limb can be rotated 90 degrees away from the stage. Edward Nelson believed that the most important part of this microscope was the introduction of trunnions that replaced the compass joint of earlier microscopes. Trunnions became common feature in microscopes produced in the second half of the 19th century. We believe this to be a rare instrument. Signed: Powell & Lealand Makers. London.
dc.identifier.uri	http://hdl.handle.net/2152.3/435
dc.language.iso	en	en_US
dc.relation.ispartof	London optician Hugh Powell (1799-1883) was already producing microscopes when he formed a partnership with his brother-in-law, Peter H. Lealand. The firm remained a major manufacturer of microscopes throughout the nineteenth century.
dc.subject	Biology
dc.subject	British Firms
dc.subject	Microscopy
dc.subject	Optics
dc.title	1.013	en_US

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