"MAIN & TANK VALVES" (SCIENTISTS.) GODDARD, ROBERT H. Two graphite drawings, unsigned, each a diagram showing a rocket valve design, with title and notes in 15 holograph words, in pencil. The notes include labels for drawing on recto ("drain" and "slot") and for drawing on verso ("Main valve / 3/8 [inch] opening / 1 1/8 [inch] opening / Tank valve . . . / drain / Tank Valves -- Bellows seal / Main -- drain"). With attestation signed by Nils Thure Ljungquist (1929-1987) at lower edge of recto: "R.H. Goddard Sketch and memo's / NTL 1973." 2 pages, 8x5 inches, drawn on recto and verso of a single sheet; toned evenly overall. Np, nd
