A brief concluding word may well be added touching those globes which may of course be classed as celestial, but which are known as moon globes and planetariums or orreries. There could be no practical value in an attempt to set forth a map of the surface of the stars, nor of the planets while our knowledge is so limited, although Schiaparelli has undertaken, with measurable success, to map the surface of Mars,[209] and it would be next in order to construct a Mars globe. Of the surface of our moon much is known and maps of it have been constructed, as indeed have been moon globes. We are informed that about the middle of the seventeenth century the Danish astronomer, Hevelius, who designed so successfully star maps, entertained the idea of constructing a moon globe,[210] but we do not know that he set his hand to the work. A century later it appears that the French astronomer La Hire actually completed a moon globe,[211] but it has been possible to obtain only the briefest reference to it. Tobias Mayer of Nürnberg, a contemporary of La Hire, set himself to the draughting of gore maps[212] intended for use in the manufacture of moon globes. Mayer found employment in the Homann establishment of Nürnberg, being regarded as an exceedingly skilful draughtsman, able to sketch on his draughting sheet that which he saw through his telescope. His plan contemplated the making of twelve gores or segments, six for the northern half of the moon and six for the southern. His plan, of course, would enable him to represent but one side of the moon,--that turned toward the earth,--although it appeared that he contemplated the addition of two segments on which, in at least a fragmentary manner, he was to represent what we may call the border of the opposite side of the moon. Mayer seems not to have completed his work, since we find nowhere an example of his finished product. It was not until near the close of the eighteenth that we again meet with an attempt to construct a moon globe and it seems that the task was accomplished by the Englishman, John Russel. It was in the year 1796 that he proposed to raise by subscription the necessary funds for making his undertaking a success. His globe has a diameter of 12 inches,[213] and was furnished with the necessary adjustable shield that the moon’s waxing and waning could be represented. That this moon globe was actually constructed, although no copy has been located, we are informed by Wolf. Such attempts as were made in the nineteenth century with a good measure of success do not here call for consideration.