The distortion, however, is necessarily enormous when the celestial sphere is presented in only six gnomonic maps.

In my maps all the stars of the British Association Catalogue down to the fifth magnitude are included on the scale of a six-inch globe.

The distortion is scarcely a fourth of that in the Society's maps.

The maps are so arranged that the relative positions of all the stars in each hemisphere can be readily gathered from a single view; and black duplicate-maps serve to show the appearance of the constellations.
It is often convenient to make small maps of a part of the heavens we may wish to study closely.

My 'Handbook of the Stars' has been prepared to aid the student in the construction of such maps.
In selecting maps it is well to be able to recognise the amount of distortion and scale-variation.