Letter from Thomas Gold to Dr Arthur Kantrowitz, AVCO-Everett Research Laboratory, 2385 Revere Beach Parkway, Everett, Massachusetts States he recently found himself embarrassed at a meeting, discussing collision-free shockwaves in ionized gases, when it transpired that no one knew of his original suggestion. Wonders if Kantrowitz could help, knowing his interest int he subject. Asks what has happened to the plan for a Hawaiian observatory, as he had expected to hear from Kantrowitz's people about a proposal, but has heard nothing. 8 July 1974