Accession No

1371

Brief Description

chemical balance, 10 1/2-inch beam, by Robinson and Barrow, English, c. 1845

Origin

England; London; 26 Oxendon Street

Maker

Robinson and Barrow

Class

balances

Earliest Date

1843

Latest Date

1845

Inscription Date

Material

wood (mahogany); glass; metal; (brass, steel, white metal); paper; stone (agate)

Dimensions

beam overall length 268mm; pans diameter 69mm; case breadth 42mm; depth 200 mm

Special Collection

Provenance

Transferred from the Cavendish Laboratory, University of Cambridge. From the Stokes Collection.

Inscription

‘Robinson & Barrow
26, Oxendon Street.
LONDON.’ (base plate)

Description Notes

Chemical balance, 10 1/2-inch beam, by Robinson and Barrow, English, c. 1845.

Brass balance; open triangle shaped beam with steel centre knife, steel end knives with inclined slit and steel pressing screw adjustment. Pointer with screwed sensitivity bob turns over graduated silvered scale on column. Two brass pans suspended from brass and steel J wires with agate planes fitted underneath. Beam supported by circular column set on square base plate fitted with two bubbles with mutually perpendicular axes. Two verticals with ‘pear’ shaped apertures supporting agate centre plane held by two knurled screws, removable to allow beam to be positioned.
Horizontal member with v notches for beam. Centre lever-operated arrestment mechanism locating beam and end planes by a crutch system. Two-piece pivoted-lever pan arrestment on base board. Base with fitted drawer for pans, beam, etc. Mahogany box of brass weights for 1000, 400, 300, 200, 100 grains. Paper box by ‘Bewley and Evans’ of grain weights (none extant). Three brass levelling screws. Glass cabinet fits over base board; glazed front and rear with hinged door at front.

Condition

References

Events