AN IMPROVED SPARK GAP OF SMALL DIMENSIONS FOR FAST SHADOW PHOTOGRAPHY Open PDF Document Details Document Type Technical Report Publication Date Apr 01, 1953 Accession Number AD0011212 Entities People H. F. Hills Tags Communities of Interest Weapons Technologies DTIC Thesaurus Topics Cameras Electrodes Flash Lamps Government (Foreign) Intensity Light Sources Magnesium Materials Metals Photographic Plates Photographs Photography Radiation Spark Gaps Technical Information Centers United Kingdom