Use of Large Refractors

It is certainly true that many of the large refractors originally designed to do micrometer work on close

Figure 19.1. The

26.5-inch (67-cm) Innes refractor at

Johannesburg, pictured in 1982 (Bob Argyle).

Figure 19.1. The

26.5-inch (67-cm) Innes refractor at

Johannesburg, pictured in 1982 (Bob Argyle).

binaries are not currently being used for this purpose and some are almost unused, such as the great 26.5-inch refractor at Johannesburg (Figure 19.1). Some are available for research by amateur observers who have a serious programme of measurement to carry out, in particular, the 50 and 76-cm refractors at Nice, as described in Chapter 21.

Refractors of 12-15 inches in aperture, of which there are many still in working order, particularly in the USA could be employed for measuring some of the new Hipparcos and Tycho pairs. The long focal lengths of many would make them suitable for using a CCD for astrometry and photometry of faint pairs.

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