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Bulb, one of a series illustrating the "Svea" glow lamp

1900

One of a series of 20 bulbs and components illustrustrating the manufacture of the "Svea" glow lamp

1900
One of a collection of historical incandescent electric bulbs; Cruto lamp, marked 'Y'.

One of a collection of historical incandescent electric bulbs; Cruto lamp

One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; lamp half frosted.

Lamp, part of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; selection of five coloured bulbs.

One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp

1900
One of a series of bulbs and components illustrating the manufacture of the "Svea" glow lamp; bulb with tube sealed in for exhausting air and with copper and platinium tubes ready for mounting filaments.

One of a series of bulbs and components illustrating the manufacture of the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; raw fibre for making filament ready for 'flashing'.

Filament fibre, part of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; Selection of four bulb caps.

One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp

1900
One of a series of bulbs and components illustrating the manufacture of the "Svea" glow lamp; bulb as first blown and glass tube for making cone.

"Svea" glow lamp; bulb as first blown and glass tube for making cone

1900
One of a series of bulbs and components illustrating the manufacture of the "Svea" glow lamp; bulb as first blown with hole in end for exhausting tube and with flange turned.

"Svea" glow lamp; bulb as first blown with hole in end for exhausting tube and with flange turned

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; bulb ready for pumping.

Bulb, one of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; bulb ready for pumping with exhausting tube cut off.

Bulb, one of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; raw fibre for making filament.

Filament fibre, part of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; finished bulbs .

Bulb, one of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; lamp frosted

Lamp, part of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; finished filaments.

Filaments, part of a series illustrating the "Svea" glow lamp

1900
One of a series of 20 bulbs and components illustrating the manufacture of the "Svea" glow lamp; raw fibre for making filament after being baked.

Filament fibre, part of a series illustrating the "Svea" glow lamp

1900