Powell & Lealand.
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The instrument, referred to as "Student's Compound Microscope" in Powell & Lealand catalogs, has a cast-iron foot and limb, painted black. It is also called the "iron" microscope. The limb supports the stage and the body-tube. The rack-and-pinion drive is located internally and operated by a brass knob. Signed: Powell & Lealand, London.