Machlett FDX 1-2 Rotating Anode Tube (ca. 1960s)

This is a rotating anode tube for diagnostic use. It was manufactured by Machlett Laboratories Inc., of Springdale Connecticut. The date of manufacture is uncertain, but I would guess the 1960s. 

It is not easy to tell from the photograph (above right), but this is a dual focus tube. In other words, there are two cathode filaments: a small one to produce a small focal spot (e.g., 1 mm x 1 mm) that would provide maximum image detail, and a large one to produce a large focal spot for higher loading. If you look closely, you might also be able to tell that the glass next to the cathode has been ground thinner to produce a rectangular window.

Size: 10" high, 4" in diameter