American physicist (1873-1975) who made major contributions to X-ray machines Three items: matte-finish 8 x 10 portrait, signed in white ink, “To Dr. Thomas K. Boyce, with best regards, W. D. Coolidge 7/31/1968”; blue ballpoint signature on a 5.5 x 8.5 sheet beneath an affixed magazine article; and a 7 x 10.25 booklet on a powerful roentgen ray tube, signed and inscribed in blue ballpoint, “To Dr. Thomas K. Boyce, with kindest regards from W. D. Coolidge - 7/31/’68” and the added postscript, “I’m sorry about the missing introductory pages.” In overall fine condition. RRAuction COA.
