Abstract
The relative effectiveness (speed) of a large telescope for a wide range of observations is compared with that of an array of smaller telescopes of the same total cost. It is concluded that, apart from a relatively small and unimportant class of observations, the array is always more effective if the new television type detector systems are to be used. Since the array can be utilized much more effectively, and by more astronomers, than a single big telescope, it should yield much more good astronomy for a given initial cost.
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