His close attention to the study of mathematics led him easily into the quest of some practical form by which to give tangible expression to his thought. It is highly probable that this fact can explain the facility with which he planned and completed at the age of thirty a clock which stands as one of the wonders of his day.157 "It is probable," says one, "that this was the first clock of which every portion was made in America; it is certain that it was as purely his own invention as if none had ever been before. He had seen a watch, but never a clock, such an article not being within fifty miles of him."158 He completed this clock with no other tools than a pocket knife, and using only wood as his material. It stood as a perfect piece of machinery, and struck the hours with faultless precision for a period of 20 years.
The successful completion of this clock attracted to Banneker the attention of his entire community, serving as the starting point of a more brilliant career. It was this display of mechanical genius which engaged the attention of the Ellicotts, who had lately moved into his neighborhood from Pennsylvania. They had already heard of the unusual accomplishments of this gifted Negro and lost no time in getting in touch with him, especially since one of the Ellicotts was himself a mathematician and astronomer of marked ability.159
The meeting with the Ellicotts was of signal advantage to Banneker, and ultimately proved the turning point in his career. They were of Quaker origin and had gone down to Maryland in 1772 in search of a desirable location for the establishment of flour mills. They were evidently persons of foresight. Being progressive, open-minded and comparatively free from the prejudices that were then mostly native to the section into which they had moved, they cordially received Banneker and frankly proclaimed his talents.160 They did not seem to permit the differences of race to erect a single barrier between Banneker and themselves in the ordinary run of their frequent business intercourse. When the Ellicotts were erecting their mills, the foundation of Ellicott City, they purchased from Banneker's farm a large portion of the provisions needed for the workmen. His mother, Mary Banneker, attended to the marketing, bringing poultry, vegetables, fruit and honey to the Ellicott workmen.161
Banneker's mechanical inclination led him to take unusual interest in the building of the Ellicott Mills, and to make frequent visits there to watch the operation of the machinery. In the course of time a store was built near the mills, and it became the meeting place of nearly all the wide-awake and worth while people in the community, who would linger together to talk of the news of the day. This was the ordinary means of news exchanging in those days when there were no dailies nor bulletins nor hourly extras. Banneker was always a welcome participant in these gatherings although he was a man of modest demeanor, never injecting himself into the conversation in an unseemly manner. When, however, he permitted himself to be drawn into discussions, he always expressed his views with such clearness and intelligence that he won the respect of his hearers.162
The friendship between George Ellicott and Banneker grew stronger as the years went by, and their common interests in mathematics and natural science led to a fellowship which often brought them together. This interest led George Ellicott to lend Banneker a number of mathematical books and instruments. Among these books were Mayer's Tables, Ferguson's Astronomy and Leadbetter's Lunar Tables. When these books and instruments were handed to Banneker it was Ellicott's intention to remain there a while to give Banneker some personal instruction in the use of them, but he was prevented by lack of time from carrying out this intention. On calling again on Banneker shortly afterward, to offer him this instruction, Ellicott was surprised to find that Banneker had already discovered for himself the key to the use of both and was "already absorbed in the contemplation of the new world which was thus opened to his view."163 They had literally made him fix his gaze on the stars, for the study of astronomy thus became his one absorbing passion.
He had now nearly covered his three score years, and it was no little tribute to his mental vigor that he should have determined at that age to master so abstruse a science as astronomy. But by degrees he gave himself up to its study with unusual zeal. His favorite method of studying this science was to lie out on the ground at night, gazing up at the heavens till the early hours of the morning. He then tried to restore his tired mind and body by sleeping nearly all the next day. This habit nearly caused him to fall into disrepute among his neighbors, who, ignorant of his plans, accused him of becoming lazy in his old days.
In 1789 he had advanced so far with his plan as to project a solar eclipse, the calculation of which he submitted to his friend George Ellicott. In the study of these books Banneker detected several errors of calculation, and, writing to his friend Ellicott, he made mention of two of them. On one occasion he wrote:
"It appears to me that the wisest men may at times be in error; for instance, Dr. Ferguson informs us that, when the sun is within 12° of either node at the time of full, the moon will be eclipsed; but I find that, according to his method of projecting a lunar eclipse, there will be none by the above elements, and yet the sun is within 11° 46' 11" of the moon's ascending node. But the moon, being in her apogee, prevents the appearance of this eclipse."
And again he wrote Ellicott:
"Errors that ought to be corrected in my astronomical tables are these: 2d vol. Leadbetter, p. 204, when anomaly is 4s 30° the equation 3° 30' 4" ought to have been 3° 28' 41". In ♂ equation, p. 155, the logarithm of his distance from ☉ ought to have been 6 in the second place from the index, instead of 7, that is, from the time that its anomaly is 3s 24° until it is 4s O°."
Acting upon the suggestion of one of his educated friends, Banneker now undertook to extend his calculations so as to make an Almanac, then the most comprehensive medium of scientific information. Banneker continued the work required to complete his almanac, and finished the first one to cover the year 1792, when he was sixty-one years old. This attracted to him a number of prominent men, among whom was Mr. James McHenry, of Baltimore, a member of John Adams's cabinet. This gentleman, through his high regard for Banneker's achievements, had his almanac published by the firm of Goddard and Angell of Baltimore. In his letter to this firm McHenry paid a fine tribute to the character of the author, although some of his statements as to Banneker's parentage do not harmonize with what appears to the writer as more reliable information from another source. McHenry laid special stress upon the fact that Banneker's work, in the preparation of his almanac, "was begun and finished without the least information or assistance from any person, or from any other books," than those he had obtained from Mr. Ellicott, "so that whatever merit is attached to his present performance is exclusively and peculiarly his own."164
That Mr. McHenry attached a wider significance to Banneker's attainments than is implied in a merely personal achievement is shown in his statement that he considered "this negro as a fresh proof that the powers of the mind are disconnected with the color of the skin, or, in other words, a striking contradiction to Mr. Hume's doctrine, that the negroes are naturally inferior to the whites, and unsusceptible of attainments in arts and sciences?" "In every civilized country," said he, "we shall find thousands of whites, liberally educated and who have enjoyed greater opportunities for instruction than this negro, (who are) his