Yours faithfully,
(Signed.)
Mr. G. Calver.
From G. W. Royston Pigott, Esq., M.D., F.R.S., F.R.A.S., &c.
Eastbourne,
July, 1880.
Dear Sir,—There has been but little weather for testing. Mr. Slack has been staying with me; we are delighted with the 8-1/2″, and think it a great beauty. I can hardly imagine any mirror much better, and I expect great precision from it. I find its focus to be 65 inches, not quite so much as my fine Dollond glass, of 3-3/4 in. aperture.
Yours truly,
(Signed.)