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Utilities are literally centralised for all four units, reducing piping. The floorplan could utilize only electric, oil or gas heat: No coal chute or bin is shown. However, coal heat was common at the time. With minor design changes, including a fuel bin and chute, the heater below the carport permits a vendor to deliver solid fuels by gravity.
The coal hole allowed the easy delivery of coal into the house's coal bunker, generally in sacks and often from the horse-drawn carts of the coal merchants. The location of the coal hole on the street minimised the distance the sacks needed to be carried and meant that sooty sacks and delivery men need not enter the house. [3]
Pieces of coal are crushed between balls or cylindrical rollers that move between two tracks or "races." The raw coal is then fed into the pulverizer along with air heated to about 650 °F (340 °C) from the boiler. As the coal gets crushed by the rolling action, the hot air dries it and blows out the usable fine coal powder to be used as fuel.
Surface railroad cars dumped coal into bins under the track, from which chutes led down to the tunnel. A tunnel car could be loaded with a full load of 3 + 1 ⁄ 2 short tons (3.18 t; 3.13 long tons) of coal in two seconds. [17] [79] [80] Coal was carried in side-dump cars, from which it was dumped into a hopper below each customer's boiler room.
Three hundred firefighters had responded to a fire that started at Throop Street where a coal chute conveyor emerged from an underground passage. The fire spread along the coal conveyor to a control room, switch house, boiler and turbine buildings and caused $8 million in damages. [3]: 288–89
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Coal was the only form of energy available to heat and light the buildings of London, either directly or after having been converted to coal gas in the adjacent gas works. Coal use was challenged by electricity, and electricity prevailed – the coal drops were redundant and fell into decay.
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