We all make errors sometimes but those who care keep right on loving us.
The inquisitors at once began to detect errors.
One reply to this is that it is not difficult to determine from time to time the errors of the screws and to apply the necessary corrections to the observations.
But a little consideration will show that when the plate is reversed 180° the effects of errors of the screws produced by wear are practically eliminated.
The chief drawback to type A is that the errors of the screw are liable to change by wear, otherwise the apparatus, as made and used at Potsdam, is, on the whole, a convenient and accurate one.