San Francisco : Architect and Engineer, Inc · leaf 417
fight to reduce noise. Looks Like a Radio Set The analyzer is similar in appearance to a radioset. On its panel are switches, dials and meters;inside are four vacuum tubes, condensers, trans-formers and similar apparatus. All this equip-ment is compactly built into a leather covered case.To… … Loading noise analyzing equipment on the GA-IS, newhigh speed air liner of the General Aviation Corporation. the audible range. The vibrating object causesalternate expansions and contractions of the me-dium surrounding the object, and these pressurechanges are transmitted in waves by the mediumto…
Architecture · Building
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