Accession Number : AD0008284


Title :   THE NOL FRAGMENT VELOCITY RANGE


Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD


Personal Author(s) : Solem, A D ; Singleton, Jr, B N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/008284.pdf


Report Date : 02 Feb 1953


Pagination or Media Count : 28


Abstract : An improved method is described for photographically determining fragment velocities from exploding cases. A multislit object-image velocity matching system was used to increase the clarity of the records obtained with the geometry of the Bragg-Messerly rotating-drum camera shadowgraph method (OSRD report 3900, July 1944). A rotating-drum camera records the passage of fragments past 3 slits lighted by G.E. FT-422 flash tubes. The film movement is parallel to the trajectory of the fragments. The fragment velocity can be calculated with a 1 to 2% accuracy from a knowledge of the fragment patch, defined by the geometry of the range, the speed of film, and spacing of successive fragment images. The maximum number of usable velocity determinations is 15 to 20 from each shot. The useful vertical beam was limited by the flash-tube length. Further developments are suggested.


Descriptors :   *AMMUNITION FRAGMENTS , *SPARK SHADOWGRAPH PHOTOGRAPHY , *BALLISTIC TRAJECTORIES , *ROTATING DRUM CAMERAS , TRAJECTORIES , GEOMETRY , VERTICAL ORIENTATION , EXPLOSIONS , FRAGMENTS


Subject Categories : Test Facilities, Equipment and Methods
      Explosions


Distribution Statement : APPROVED FOR PUBLIC RELEASE