the first with a row of six small tubes, held by single conductive bar at the base, individually held at the top, plaque for F. E. Becker & Co.; the other of frame-form with four larger tubes held in a similar way, each of the tubes holding a different gas - the largest tubes 12in. (30.5cm) long
the first with a row of six small tubes, held by single conductive bar at the base, individually held at the top, plaque for F. E. Becker & Co.; the other of frame-form with four larger tubes held in a similar way, each of the tubes holding a different gas - the largest tubes 12in. (30.5cm) long
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
