[Third Edition] — THE ADJUSTMENT & TESTING OF TELESCOPE OBJECTIVES

York: T. Cooke & Sons, Ltd. 1921. 8vo., pp.123, boards quarter bound in contrasting paper, tan title inlay to spine, uncut, one b/w plate, b/w illustrations throughout, toning to margins, occasional pencilling, closed tears to pages, 73, 75, 77, light wear to boards, particularly to extremities, mark to front and rear board, overall a good copy.