Unfortunately his death in 1762 interrupted a work which would have surpassed in accuracy every previous effort of the kind.
Next appears Schroeter of Erfurt (1745-1816), a fine observer (he first discovered the Lunar _Rills_), but a poor draughtsman: his maps are therefore of little value.

Lohrman of Dresden published in 1838 an excellent map of the Moon, 15 inches in diameter, accompanied by descriptive text and several charts of particular portions on a larger scale.
But this and all other maps were thrown completely into the shade by Beer and Maedler's famous _Mappa Selenographica_, so often alluded to in the course of this work.

This map, projected orthographically--that is, one in which all the rays proceeding from the surface to the eye are supposed to be parallel to each other--gives a reproduction of the lunar disc exactly as it appears.

The representation of the mountains and plains is therefore correct only in the central portion; elsewhere, north, south, east, or west, the features, being foreshortened, are crowded together, and cannot be compared in measurement with those in the centre.

It is more than three feet square; for convenient reference it is divided into four parts, each having a very full index; in short, this map is in all respects a master piece of lunar cartography.[B] After Beer and Maedler, we should allude to Julius Schmitt's (of Athens) excellent selenographic reliefs: to Doctor Draper's, and to Father Secchi's successful application of photography to lunar representation; to De La Rue's (of London) magnificent stereographs of the Moon, to be had at every optician's; to the clear and correct map prepared by Lecouturier and Chapuis in 1860; to the many beautiful pictures of the Moon in various phases of illumination obtained by the Messrs.