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Document number: 137
Date:
Watermark: 1861
Recipient: TALBOT William Henry Fox
Author: KELLAND Philip
Collection: British Library, London, Manuscripts - Fox Talbot Collection
Last updated: 15th July 2010

My dear Sir,

You will find the subject of Reciprocal polars very well treated of in [illegible] which I now send.

The word reciprocal is sometimes (improperly) used for a curve to a radius vector the reciprocal of another e.g.

[illustration]

if rcosč = a be the equation to a st. line 1/r cosč = a is the equation to a circle mathematical equation of which the radius is ½a.

I am Yours vy truly
Philip Kelland

H. F. Talbot Esq

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