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Title: Free surface water tunnel (Hydrodynamics Lab)
Format: drawing
Date: 1945

Title: Controlled atmosphere launching tank (Hydrodynamics Lab)
Format: drawing
Date: 1945

Title: Drawing, “Japanese Balloon Ballasting Control” (top half)
Format: photograph: print
Date: 1945
Description: Photographic print of perspective drawing, with wiring diagram overlaid. 11x17 inches. Signed R. W. Porter and dated 1945. Porter Papers Oversize.

Title: Drawing, “Japanese Balloon Ballasting Control” (bottom half)
Format: photograph: print
Date: 1945
Description: Photographic print of perspective drawing, with wiring diagram overlaid. 11x17 inches. Signed R. W. Porter and dated 1945. Porter Papers Oversize.

Title: Rendering of controlled atmosphere launching tank
Format: drawing
Date: 1945

Title: Night binocular installation in P-61 aircraft
Format: photograph: print
Date: 1945
Description: Perspective drawing, exterior view looking into cockpit. 11 x 6.75 inches, signed R. W. P. and date 1945. Porter Papers.

Title: Milton Plesset at scene of crash landing
Format: photograph: negative
Date: 1945
Series: Academic Divisions

Title: Theodore von Karman, Dryden, Prandtl and Tsien
Format: photograph: negative
Date: 1945
Series: Individuals
Description: Photo was taken in Germany. Von Karman is second from right and Tsien is on the far right.

Title: PIR-22A fuze
Format: photograph: negative
Date: 1945
Description: There is no information on how this fuze differs from PIR-22. PIR-22 was made for the 5.0″ HVAR and was 6.02″ long. It was built to be more impact-resistant and more reliable than PIR-20 (Mk164). Preliminary tests were done in September, 1945.

Title: PIR-21 (Mk165) fuze
Format: photograph: negative
Date: 1945
Description: This was a modification of PIR-2 with elements of PIR-19. Distinguishing feature is that the fuze head and rocket motor adapter are made in one piece. About 0.33″ longer than PIR-2 fuzes, apparent in extension of magazine. During March-June 1945 about 50,000 were manufactured and loaded by Caltech.