The explosion from a 4,000 pound bomb, Aberdeen Proving Ground, Maryland

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  Military airplane and missle, Aberdeen Proving Ground, Maryland

  Manuscripts

  Plane and missile, not long after missile was released. Perforation stamped "confidential." Note in the hand of Grace Burke Hubble: "EPH Huntington Library"

  mssHUB 1044 (21)

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  Military airplane and missile, Aberdeen Proving Ground, Maryland

  Manuscripts

  Plane and missile, not long after missile was released. Stamped with perforations "confidential." Note in the hand of Grace Burke Hubble: "EPH Huntington Library"

  mssHUB 1044 (20)

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  Measuring instruments at the U.S. Ballistic Laboratory, Aberdeen Proving Ground

  Manuscripts

  Machinery, Ballistics Research Laboratory. Photographer: Photographic Measurements Section, U.S. Army Ballistic Laboratory. Note in the hand of Grace (Burke) Hubble: "EPH, Huntington Library Collection." Possible measuring instruments, in three compartments, labeled Pitch, Lift, Drag.

  mssHUB 1044 (9)

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  Eight-inch blassistic shell 150 feet beyond muzzle, U.S. Army Ballistic Laboratory

  Manuscripts

  Eight inch shell about 150 feet beyond muzzle, just after being fired, Ballistics Research Laboratory. Note in the hand of Edwin Powell Hubble: "8-inch shell about 150 ft beyond muzzle, velocity about 2300 ft/sec. Microflash exp. @ 1/1,000,000 second." Note in the hand of Grace (Burke) Hubble: "EPH Huntington Library"

  mssHUB 1044 (18)

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  Shadow photograph of air shock waves off a 37 mm shell, at the U.S. Army Ballistic Laboratory

  Manuscripts

  Shadow photograph of test results, showing air stream off 37 mm shell, Ballistics Research Laboratory. Note in the hand of Edwin Powell Hubble: "Shadow photo by spark (exp. @ 1/1,000,000 second), 37 mm shell velocity about 2500ft/sec. Note shock waves in air skin friction along sides turbulence in wake." Note in the hand of Grace (Burke) Hubble: "EPH Huntington Library."

  mssHUB 1044 (19)

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  Edwin Powell Hubble and seven unidentified men in an office at the U.S. Army Ballistic Laboratory, at Aberdeen Proving Ground

  Manuscripts

  Edwin Powell Hubble and seven (7) other men in an office of the supersonic wind tunnel building at the U.S. Army Ballistic Laboratory, Aberdeen Proving Ground. Hubble is third from the right. Note in the hand of Grace (Burke) Hubble: "EPH (on left, Atkinson of Greenwich Ok.) office in Supersonic Wind tunnel Building APG".

  mssHUB 1043 (6)