Stemming tube through which gases are pumped from the valve, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Electrode support wires of nickel with seal wires and copper leads welded on by an oxy-hydrogen flame, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Flanged glass tube from which the 'foot' is made, before insertion fo stemming tube and wires, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Completed foot, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London, late 19th - early 20th century

Foot with support wires bent and heater supports hooked, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Foot with cathode and heater attached, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Grid, machine made and formed, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Grid and cathode assembled on foot, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Foot with glass bead assembly welded to supports, holding grid and cathode rigidly, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Anode, pressed from nickel sheet, in halves before assembly, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Assembled foot complete with cathode, grid and anode, and magnesium 'getter' in cup attached to anode, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Bulb washed and steam dried, ready for 'sealing in', one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Complete 354V valve assembled for 'pumping', one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

Moulded bakelite base, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,

354V valve marked, pumped, capped and tested, one stage in the manufacture of an indirectly heated 3-electrode valve designed for use as a detector in receivers operated by alternating current, type 354V, Mullard Radio Valve Co. Ltd of London,