This bridge over the canal in Regent's Park has three names. It was originally called North Gate Bridge because it carried the northern carriage entrance to the Park. Its name was then changed to Macclesfield Bridge after Lord Macclesfield, Chairman of the Regent's Canal Company who solved a financial crisis when the company ran out of money before the canal was finished. It is best known, however, as Blow-Up Bridge, commemorating an accident here in 1874, when a barge carrying gunpowder exploded. The bridge was destroyed, but its cast-iron columns, although blown down, were undamaged are were re-used when the bridge was re-built. Joan Lock's book "Dead Image" is a detective story set around this incident.