## 2-56-11. William Thomson to H. Poincaré

June 30, 189411 1 This letter was penned by a copyist.

34, Hans Place S.W.

Dear Mr. Poincaré,

I ought long ago to have thanked you for your kind letter of the 28th May. The promised second volume of your “Méthodes Nouvelles” came to Glasgow during my absence and has been forwarded to me here.22 2 Poincaré 1893.

I am very much pleased to have it and I find in it exactly what I wanted in regard to the equation

 $\frac{d^{2}u}{dx^{2}}=\Pi(x)u.$

I have to thank you also for your beautiful volume “Les Oscillations Electriques” which I have also received here and which I find full of most interesting matter.33 3 Poincaré 1894.

Believe me, Yours very truly,

Kelvin

ALS 3p. Private collection, Paris 75017.

Time-stamp: "23.09.2014 00:39"

## References

• H. Poincaré (1893) Les méthodes nouvelles de la mécanique céleste, Volume 2. Gauthier-Villars, Paris. External Links: Link Cited by: footnote 2.
• H. Poincaré (1894) Les oscillations électriques. Carré et Naud, Paris. External Links: Link Cited by: footnote 3.