Airspeed Adjustment Module for Course Setting Bomb Sight RAF F-106 and three navigator dividers

and three navigator dividers

The ARN-7 system (see diagram)

the signal received was a stream of dots or dashes and he corrected his course until the signal changed to a steady pulse

On this style of air speed indicator

Airspeed Adjustment Module for Course Setting Bomb Sight RAF F-106 and three navigator dividersWe have been advised that this item is an Airspeed Adjustment Module for use with early versions of the British RAF's Course Setting Bomb Sight (aka Wimperis). We do not have corroborating information. A photo of such a sight is in the photo gallery, indicating where this module would be installed, however, what is pictured is not the exact module shown here. Measures ~ 5 inches long and 4 inches wide. Made of metal.