For one week only, "MULTUM IN PARVO." Commencing September 21st.
One of the latest mechanical devices in this mechanical age is a new switch which floods an air port with light at the sound of an approaching aeroplane. The drone of the aeroplane motor is used to start a sympathetically tuned ■ reed vibrating; as the aeroplane approaches tho low note of its motor sets the reed in. vibration and the reed: - on:; vthe^ powerful '
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Bibliographic details
Hutt News, Volume 1, Issue 15, 6 September 1928, Page 6
Word Count
74Page 6 Advertisements Column 3 Hutt News, Volume 1, Issue 15, 6 September 1928, Page 6
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