Until the 1970s, when you handed money to a sales assistant in Selfridges, the assistant did not give you change. They could not. There was no till at the counter. There was instead a small brass aperture on the wall behind the counter, and the assistant rolled your banknotes and the docket into a wooden or metal canister, screwed it into the tube, pulled a handle, and your money flew off through the building's walls to a centralised cash office somewhere out of sight, where a clerk processed the transaction, signed the receipt, screwed the change back into the canister, and fired it back. You waited at the counter. The whoosh of returning canisters was a constant retail sound, and the tubes that carried them were called Lamsons.

William Stickney Lamson, a Civil War veteran who ran a five-and-dime in Lowell, Massachusetts, patented the first cash-carrier system in 1881. The original was almost comically simple: hollow wooden balls rolling along gently sloping wood-and-leather rails, propelled by gravity from the sales counter to a cashier's loft above. He founded the Lamson Cash Carrier Company in Boston the next year. By 1884 an Irish-American agent, John Magrath Kelly, had set up the British arm in London and secured the European, African, Australian and Middle Eastern rights to the patents. By 1888 the Lamson Store Service Company Ltd was capitalised at £85,000, the equivalent of nearly ten million today.

The technology evolved fast. Wire systems came next, suspended pulleys that fired carriages between counter and office on tensioned cables. Then, in 1899, Lamson absorbed an American rival, the Bostedo Package and Cash Carrier Company, and renamed it the Lamson Pneumatic Tube Company. That was the form the technology took for the next seven decades. By 1911 there was a purpose-built factory at Hythe Road, Willesden Junction, in northwest London, and the tubes were going into Selfridges, Harrods, John Lewis, Whiteley's and the Army & Navy.

What is hauntological about Lamson is not the equipment, which is well-documented and unambiguous. It is the spatial logic. The till did not live where the sale happened. The till was a room. Money was a thing in motion through walls. The cashier was an institution rather than a piece of equipment, and the act of selling something to a customer involved temporarily losing physical possession of their payment to a separate department of the building. This required trust between assistant and customer that has no modern analogue, the till being now the thing that confirms the sale rather than the thing the sale waits on. It also required an architecture. Every counter piped or wired to a central node. Every store designed around the geometry of cash movement. Walk into a flagship interwar department store with the original Lamson layout in mind, and the floor plan suddenly makes sense in a way it cannot if you assume the till has always been a box on a shelf.

The British systems lasted longer than they should have. Lamson Engineering Ltd, formed by merger in 1937, only ceased independent operation in 1976, when it was acquired. By that point most stores had moved to electronic point-of-sale terminals, but a number of installations stayed running well into the post-war decades, sometimes for cash, sometimes downgraded to internal mail. A few survive as restored curiosities. The Up-to-Date Store at Coolamon, in rural New South Wales, still has its original ball-and-rail system in working order, the only such installation known anywhere.

There is a particular lesson here for anyone who has worked in modern retail and assumes the till is a kind of natural fact, the place where money meets transaction at the point of contact. It isn't. There was a longer era when the building counted the money for itself, in a single secret room, and you waited politely for the canister to come back.

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