7th Aug, 2024 11:00

Photographica
 
  Lot 8
 

A Rare and Early Andrew Ross Co. Brass Achromatic Compound Microscope

A Rare and Early Andrew Ross Co. Brass Achromatic Compound Microscope

c.1839-1843, Engraved to the rear of the large ‘Y’ shaped foot ‘ANDw ROSS & CO, Opticians, 33 Regents St. Picadilly'

The microscope with Brass tribach foot and cork pads; brass pillar; joint with key clamp; limb carried oxidised brass stage; mechanical stage with sliding clip and spring bar; upper stage rotates manually; tail piece with swinging plano/concave mirror; triangular sectioned limb with rack; shoe with two knurled screws operating focus to tabular body; fine focus screw on the body bears down on brass ring round inner draw tube; fitted wooden box with additional eyepieces and with manuscript table written in ink and pasted to inside of case door stating the 'Magnifying Powers of the various object glasses in eyepiece' with minor losses.

Objectives:

1/8" Objective the can engraved '1/8In Andw Rofs & Co Opticians 33 Regent Street Piccadilly' this historically important objective was the first available with a correction collar, this one missing one of the screws

1/4" Objective the can engraved '1/8In Andw Rofs & Co Opticians 33 Regent Street Piccadilly'

1/2" Objective the can engraved '1/8In Andw Rofs & Co Opticians 33 Regent Street Piccadilly'

1" Objective the can engraved '1/8In Andw Rofs & Co Opticians 33 Regent Street Piccadilly'

2" Objective the can engraved '1/8In Andw Rofs & Co Opticians 33 Regent Street Piccadilly'

In 1837, Andrew Ross began to sign his instruments ‘& Co’ - the company being J.J. Lister. Ross and Lister collaborated over designing instruments that were sufficiently stable to match the power of Lister’s objective lenses.

This instrument was first described by Ross in 1839 and represents a totally new form of microscope. The limb was made in a single casting, which supported the body and stage. A rack at the back of the limb focused the body tube. The limb was then jointed to the pillar by a compass joint in the traditional way. Lister is thought to have been closely involved with the design for the limb, which is often referred to as the ‘Lister Limb’.

Reference:

https://collections.whipplemuseum.cam.ac.uk/objects/11736/

Sold for £2,142

Includes Buyer's Premium


 

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