Tempus (Time Signal Receiver)

The Tempus was a specialized crystal radio receiver produced by W. J. Badman & Co. It was specifically designed for watchmakers, jewelers, and horologists to obtain exact standard time by tuning into long-wave time signals transmitted twice daily from the Eiffel Tower (FL) in Paris (at 10:44 AM/PM) and Nauen (POZ) in Germany (at 11:55 AM/PM).

The Tempus was developed and sold simultaneously alongside the Horophone (manufactured by the Synchronome Co. / Frank Hope-Jones). Both sets filled the vital niche of providing precise time calibration (accurate to within one-tenth of a second) in the era before automated telephone speaking clocks ("TIM") or BBC broadcast time pips.

Technical Features & Variants
Integrated Test Buzzer:
Because crystal detectors required precise mechanical adjustment, the Tempus incorporated a built-in battery-operated test buzzer. Acting as a weak, local untuned spark transmitter, the buzzer allowed the operator to find a sensitive point on the cat's whisker before the scheduled time transmission began.

Cabinet & Model Options:

• Type A ("Workshop Model"): Box-like wooden cabinet with hinged lid, batteries, and testing buzzer. Dimensions: 8 x 7 x 5.5 inches. Price: £5.
• Type B ("De Luxe Model"): Larger cabinet with internal headphone storage space. Dimensions: 8.5 x 8 x 7 inches. Price: £7 (or 10 shillings extra over Type A).

Accessories:
Optional Brown’s 4000-ohm double headphones were offered for £2 17s 6d (or a single earphone for £1 5s 0d).

Documentation:
Supplied with an original instruction manual containing graphical dot-and-dash code charts for decoding Eiffel Tower and Nauen time signals, alongside Postmaster General (PMG) regulations for single-wire (100 ft) or twin-wire (140 ft) outdoor aerial installations.

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Elenco delle radio e altri apparecchi della Badman, W. J. & Co.; Weston-Super-Mare