It appeared near the Houses of Parliament on Wednesday 9 December 1868. It looked for all the world like a railway signal: a revolving gas-powered lantern with a red and a green light at the end of a swivelling wooden arm.
Its purposes seemed benign, and we obeyed its instructions willingly. Why wouldn’t we? The motor car had yet to arrive, but horses, pound for pound, are way worse on the streets, and accidents were killing over a thousand people a year in the capital alone. We were only too welcoming of of anything that promised to save lives.
A month later the thing (whatever it was) exploded, tearing the face off a nearby policeman.
We hesitated. We asked ourselves whether this thing (whatever it was) was a good thing, after all. But we came round. We invented excuses, and blamed a leaking gas main for the accident. We made allowances and various design improvements were suggested. And in the end we decided that the thing (whatever it was) could stay.
