Cast iron subway vault/ sidewalk panels. Sold in individually.

28 in stock. One is missing a glass plug and some have chips in the plugs.

The last 2 images show the missing plug and an example of a chipped plug.

24" x 24" x 7/8", very heavy.

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Before the introduction of electricity, one Thaddeus Hyatt came up with this idea in 1854; cast iron panels containing thick glass plugs. These panels could be laid in sidewalks allowing daylight to pass through to basements and other useable spaces below ground but still be strong enough to allow for pedestrians to walk above.