November 7th, 1899 letter from Nikola Tesla to George Scherff

Colorado Springs, Nov. 7, 1899

Dear Mr. Scherff,

Inclosed check for bills forwarded $225 on account. Please pay from this to Mr. Czito's wife $50. He will pay my loan off $5 every week beginning from week after next.

Sorry you did not know better how to select mica for condenser. I wrote especially about it. You must never take large sheets, the exposure reduces rapidly with time.

Sincerely,
N. Tesla

Have not you received that little book on energy transmission.