LIST OF OBJECTS SEEN WITH A 5-1/4 INCH REFLECTOR.

ξ Scorpii (5, 5·2 : 1″·3) clearly divided, 186 power.

ε Lyræ. Debilissima quite easy; 186, 380 powers, though nearly half

Moon.

μ^1 Herculis (9·4, 10 : 1″·04). Just divided, 380. Very difficult,

owing to its faintness.

Vega. 11 mag., comes quite plain, only 47 minutes before sunrise;

powers 110, 186.

φ Virginis (5, 13 : 4″·27). Comes plain, 110, 186.

ν Scorpii, the close pair (4, 5 : 0″·8), well elongated, power 380;

small star (7, 8 : 1″·68) divided, 110.

ζ Boötis (4, 5 : 0″·88) elongated 186, notched 380, and with field

lens removed, all but divided.

δ Cygni (3, 9 : 1″·63), 9 plain, 380 on several occasions.

Antares is chiefly an atmospheric test, but the companion was quite

plain on one occasion out of the three I looked for it.

μ^2 Boötis (7·5, 8 : 0″·63), considerably elongated, 380.

η Coronæ (5·5, 6 : 0″·62), slightly elongated, 380; but not nearly

so much as μ^2 Boötis.

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 60 / 62 题