so that the low power, eg x10, is in line with the stage. Turn the coarse focus so that the stage is as close to the objective lens as possible. You should not look through the microscope to do this.

The compound microscope uses two lenses to magnify the specimen: the eyepiece and an objective lens. In most microscopes, there is a choice of objectives to use.

The practical hints on focussing, copying and enlarging are excellent; and we quite concur in the advice on p. 95 to avoid second-hand lenses. Some admirable examples of the performance of lenses ...