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Wollaston slide rule of chemical equivalents

1814
[Letter] 1816 Jan 4, Buckingham Street, Fitzroy Square [to] Saml. Parkes, Chemical Laboratory, Goswell Street / W.H. Wollaston. [2p. on 1 leaf, holograph signed. Is unperturbed by Parkes's information that a foreign producer is intending to export "platina" to England; suggests a better market for this unidentified producer is Paris, where Wollaston has refused to trade]

Letter 1816 Jan 4

1816
Sliding scales of chemical equivalents, has 1.243 written in on upper half of left hand side and no publisher's name on the bottom.

Wollaston slide rule of chemical equivalents, England, about 1814

1814
[Letter] 1825 Mar, Buckingham Street, Fitzroy Square, London [to] Charles Macintosh/W.H. Wollaston. [Hastily written in reply to urgent request for an opinion on Macintosh's steel samples. Urges immediate patent application. Postscript describes Macintosh's distillation of coal tar as being better than "laborious condensation of peat" and advises him on methods of reducing iron oxides. Accompanied by typed transcript [19--] of part of the letter also giving some background information.]

Letter 1825 Mar

1825
Glass tube of rhodium - tin alloy prepared by the discoverer Dr. William Hyde Wollaston about 1825

Specimen of Rhodium Alloy in roughly triangular pieces

1822-1825
Sliding scales of chemical equivalents, has 1814 date clearly at the bottom and alumina inscribed on the upper part of the left hand scale.

Wollaston slide rule of chemical equivalents, England, 1814

1814
Slice of rhodium alloy prepared by W.H. Wollaston, c.1822-1825.

Slice of rhodium alloy prepared by W.H. Wollaston, c.1822-1825

1822-1825