The Hurt Locker

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Image: Wellcome Trust

The iron maiden, the medieval torture device consisting of a hinged cabinet with a spike-lined interior, seems to have been a myth. There’s no mention of it before the 19th century.

Bielefeld University legal historian Wolfgang Schild suggests that enterprising exhibitors may have pieced together the first specimens using artifacts gathered from museum collections, to attract paying customers. It’s possible that German philosopher Johann Philipp Siebenkees invented a history for the device — in his writings he claims that it was first used on Aug. 14, 1515, to execute a coin forger. But there’s no reliable evidence for it in the Middle Ages.

Amara’s Law

“We tend to overestimate the effect of a technology in the short run and underestimate the effect in the long run.” — Roy Amara, president of the Institute for the Future, 1978

(“A modern maxim says: People tend to overestimate what can be done in one year and to underestimate what can be done in five or ten years.” — J.C.R. Licklider, Libraries of the Future, 1965)

The Blast Shadow

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On the morning of Aug. 6, 1945, a customer was sitting on the steps of Sumitomo Bank in Hiroshima, waiting for the branch to open, when an atomic bomb exploded over the city. The bank was only 260 meters from ground zero, and as the intense heat burned its stone face white, the customer’s body shielded one section of the steps, leaving a “shadow” in that place.

The steps are now preserved in the Hiroshima Peace Memorial Museum.

In 1946, the British mission to Hiroshima and Nagasaki noted that the surfaces of asphalt roads “retained the ‘shadows’ of those who had walked there at the instant of the explosion.” It called them “objects of macabre interest and pilgrimage for visitors.”

A Salt Hygrometer

An “easy and curious method of foretelling rainy or fine weather,” from an 1860 book on conjuring, of all places:

“[T]he best instrument of all, is a good pair of scales, in one of which let there be a brass weight of a pound, and in the other a pound of salt, or of saltpetre, well dried; a stand being placed under the scale, so as to hinder it falling too low. When it is inclined to rain, the salt will swell, and sink the scale: when the weather is growing fair, the brass weight will regain its ascendancy.”

Perspective

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This is the oldest surviving successful aerial photograph, shot in October 1860 by James Wallace Black from a hot-air balloon 1,200 feet over Boston.

He called it Boston, as the Eagle and the Wild Goose See It.

06/22/2026 UPDATE: The photo was named not by Black but by Oliver Wendell Holmes!

In July 1863, Holmes wrote in the Atlantic Monthly (page 12): “Boston, as the eagle and wild goose see it, is a very different object from the same place as the solid citizen looks up at its eaves and chimneys. The Old South [Meeting House] and Trinity Church [left center and lower right] are two landmarks not to be mistaken. Washington Street [bottom] slants across the picture as a narrow cleft. Milk Street [left center] winds as if the old cowpath which gave it a name had been followed by the builders of its commercial palaces. Windows, chimneys, and skylights attract the eye in the central parts of the view, exquisitely defined, bewildering in numbers … As a first attempt [at aerial photography] it is on the whole a remarkable success; but its greatest interest is in showing what we may hope to see accomplished in the same direction.”

Only two years later the Union Army would use balloon photography to spy on Confederate troops during the Peninsular Campaign in Virginia.

(My thanks to reader Adam Mellion.)

Borrowed Time

A striking detail from Martha Tyson’s Sketch of the Life of Benjamin Banneker (1854):

Whilst they were conversing his clock struck the hour, and at their request he gave an interesting account of its construction. With his imperfect tools, and with no other model than a borrowed watch, it had cost him long and patient labor to perfect it, to make the variation necessary to cause it to strike the hours, and produce a concert of correct action between the hour, the minute, and the second machinery. He confessed that its regularity in pointing out the progress of time had amply rewarded all his pains in its construction.

This seems to be at least plausibly true: In 1753, the 21-year-old Banneker, who had never seen a clock, borrowed a watch from a trader, made drawings of its workings, and designed a wooden clock of his own. Peter N. Stearns writes in Time in World History (2020), “Banneker, the son of former slaves, borrowed a watch from an acquaintance, took it apart, ultimately using this as a model to build an impressively accurate clock entirely from carved wooden pieces, and then capitalized on the notoriety of this product to set up his own repair operation.” The clock continued to operate until Banneker’s death more than half a century later.

To the Life

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John Owen, one of the last veterans of the French and Indian War, lived to be 107 and posed for this photograph shortly before his death in 1843.

That makes him one of the earliest-born humans ever to be photographed. He was born in 1735.

Efficiency

Just a bit of trivia: In the New South Wales railway system, the telegraph code RYZY meant:

Vehicle No ….. may be worked forward to ….. behind the brakevan of a suitable goods train during daylight provided locomotive branch certifies fit to travel. If the damaged vehicle is fitted with automatic coupling it must only be worked forward behind a brakevan also fitted with automatic coupling by connecting the automatic couplers on each vehicle but, if fitted with ordinary drawgear, it must be screw coupled. Westinghouse brake to be in use throughout train and on damaged vehicle. Guard to be given written instructions to carefully watch vehicle en route.

This reduced a 90-word message to four letters.