Souvenir typescript of "The Ten Special Commandments for a Would-Be Planet Hunter according to Clyde Tombaugh," one page, 8.25 x 10.75, signed at the conclusion in black felt tip, "Clyde W. Tombaugh, Discovered 9th planet, Pluto, on 18 Feb 1930." In full: "Behold the heavens and the great vastness thereof, for a planet could be anywhere therein. / Thou shalt dedicate thy whole being to the search project with infinite patience and perseverance. / Thou shalt set no other work before thee for the search shall keep thee busy enough. / Thou shalt take the plates at opposition time lest thou be deceived by asteroids near their stationary positions. / Thou shalt duplicate the plates of a pair at the same hour angle lest refraction distortions overtake thee. / Thou shalt give adequate overlap of adjacent plate regions lest the planet play hide and seek with thee. / Thou must not become ill in the dark of the moon lest thou fall behind the opposition point. / Thou shalt have no dates except at full moon when long exposure plates cannot be taken at the telescope. / Many false planets shall appear before thee and thou shalt check every one with a third plate. / Thou shalt not engage in any dissipation, that thy years may be many, for thou shalt need them to finish the job!" In fine condition.
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