PHILIPS "BEEHIVE" DUAL CONCENTRIC TUNING UNIT, 1930's

Two sets of cylinders or tubes are aligned within each other (this unit has three sets), in the picture only the outer tubes can be seen, one set is fixed and the other moves in and out by moving the shaft. This changes the capacitance of the unit. Designed by Philips in the 1930's similar devices were used in all there sets after this.
Similar to that used in item A1116 the Philips 660 Wireless.

A0745