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Pendulum gravity on Guam

In 1819 Louis de Freycinet measured gravity on Guam using four pendulums, and in 1828 Fyodor Litke did the same thing, with just one pendulum. How well did they do?

Pulau Anso: another missed opportunity

The astronomer John Goldingham makes an appearance in ‘The Hunt for Earth Gravity’ on account of pendulum measurements he made in his observatory in Madras (modern Chennai), but he has another claim to fame. He was responsible the first gravity measurements made in Sumatra or, rather, on one of its offshore islands.

The magnetics of DC power

For magnetic surveys, power lines are a nuisance. Normal AC lines can interfere with magnetometer electronics if you get too close. But what about DC lines? Just forget about working anywhere near them.

Pendulums and geology’s strongest gravity effect

There has to be a point on the Earth’s surface where the effect of geology on gravity is greatest. With the sea-covered areas unlikely settings because of the low density of sea water and almost all land areas now covered to some extent by gravity surveys, it is possible to say, with a fair degree of confidence, where that place is. It is on the largest of the Bonin (or Ogasawara) Islands, Chichi-jima,

Thoughts on the Lairg gravity low

In 2008 Ken Amor and a group of his colleagues from Oxford and Aberdeen universities published a reinterpretation of the Stac Fada member of the Stoer Group sediments that outcrop on Stoer beach and in some other similar localities in the northwest of Scotland....

“Mea culpa” on Myanmar gravity

I imagine that anyone trying to write a history of anything is all too aware of the probability (near certainty) that something important will have been left out. Sometimes new documents will emerge after the book or paper has been finalised, sometimes things just get...