56 Herculis (6·5, 13 : 15″), 13 easy, all powers.

π Aquilæ (6, 7 : 1″·5). Just separated, 110; 14 mag. (Webb), just

visible, 186.

ε Equulei. Just divided, 186 (5·7, 6·2 : 1″·0).

* * * * *

_From_ D. TRAILL, Esq.

BALHAM,

_March 5th, 1880_.

MY DEAR SIR,—I have at present to use the telescope, an 8-1/2 in.

Alt Azimuth, out of a window, and so at a great disadvantage,—in

fact cannot give it a fair trial till I have the house ready for it,

meanwhile I use it as occasions offer, and have been highly pleased

with it. The views of the nebular in Orion resemble those of BOND’S

drawings, and shows immeasurably above my 3-1/4, of course. I think

the mirror is _perfect_ from its performance on large stars whose

disks are small and round, without rays of any kind. I am

_thoroughly_ satisfied.

Yours truly,

(_Signed_.)

Mr. G. CALVER.

* * * * *

_From_ HUGH AULD, Esq.

New Edition of Hints on Silver-Glass Reflecting Telescopes Manufactured by Mr. G. Calver, F.R.A.S. with Directions for Silvering, Adjusting, &c. · 第 61 / 62 题