$7,500
Typed letter signed (A. Einstein") to Mr. Hans Cassel [Palo Alto, CA], Princeton, N.J., January 27, 1937, inink on stationary paper measuring 8 1/2" x 11" (three pages). Einstein writing "The arguments you use are absolutely incomprehensible to me." (Cond: paper shows creases from folding, age toning, paperclip transfer marks. Provenance: Family of Dr. Hans Cassel, Boca Raton, FL (12000/15000)German to English Translation: Princeton N.J. January 27, 1937 112 Mercer Street Mr. Hans Cassel 195 Park Blvd. Palo Alto, CA Dear Mr. Cassel: Now I have hope that we will bring clarity in the case. You really answered this time my letter. I am going to tell you exactly now, to what extent I can not follow your Thoughts. 1. We agree on your version over: If there is an overload of outer pressure ∆ on the semipermeable membrane which is surrounded by drops, then the vapor pressure increases which creates the drop forming liquid from pₒ to p according to formula lgp = lgpₒ + a ‘ ∆ ….(1) Because they are minor modifications, we can do this lgp - lgpₒ = lg p/pₒ = ………………………………………………… Included in (1) we get with enough nutrition P = Pₒ + d ‘ pₒ ∆, or p = pₒ + A ∆ ….(1a) Whereby A means is a constant of (a’ pₒ). 2. We further agree over, that for ∆ the Capillary pressure 2G/p is to be used so that we get: p = pₒ + 2AG/p……(1b) 3. Now there is a serious point, in which I do not understand you, namely the requirements for the stability of the drop. I claim that the drop is stable, when a. (1b
Auctioneer:
Auction Gallery of the Palm Beaches
Date:
2011-06-27
