b'Editors desk Editors deskThis Christmas issue of Preview is notstandards for magnetotelluric time-seriesAnd, on behalf of the Preview team, a only a bumper issue but comes withdata and one on The Australian nationalvery happy festive season and a happy bells and whistles. There should bedifferential RTP gridmeaty stuff! New Year to you all!!something in these pages for even the most jaded reader! And, of course, our regularLisa Worrall commentators continue to surprisePreview Editor Don Emerson delivers with a special onand delight. David Denham (Canberraprevieweditor@aseg.org.auGarnet: The colourful silicate, a specialityobserved) reviews the outcome of mineral - a gem for the season if thereCOP26. Marina Pervukhina (Education ever was one! We also feature our annualmatters) interviews Ishtar Barranco from summary of student theses completed inChevron about what new graduates 2021. Twenty seven students contributedcan expect in her industry. Mike Hatch to this summary making it clear that(Environmental geophysics) encourages specialised training in geophysics isDave Allen to describe the development thriving in Australia. Graduates inof the AgTEMa story that is very geophysics should also have their pick ofentertaining! Terry Harvey (Mineral jobs in coming years, as it is pretty cleargeophysics) considers evolution in the that we are on the cusp of a boom time inapplication of geophysical techniques. mineral exploration in Australia and aroundMick Micenko (Seismic window) reviews the world. This boom is being driven bywavelets, spectra and transforms. Tim the demand for critical minerals, or newKeeping (Data trends) investigates economy minerals in the parlance of thedomaining, and Ian James (Webwaves) Queensland Government. These mineralsmarks up and down.include some of our old favourites, such as nickelwithout which electrification of ourAs another COVID year bites the dust, economies will not be happening! Id like to thank all Previews regular contributors - especially our Associate In addition to these features we haveEditorsfor their contributions. PreviewThe Editor researching locations for AEM 2023any two technical notes, one on Metadatawould be nothing without you!! excuse!Letter to the EditorDear Editor half cables to the east of the corvette.error of several hundred mGal. The results In a footnote Dunmore noted that thiswere barely usable for Malaspinas global In Roger Hendersons interesting articleplaced Malaspinas observatory at thereconnaissance (he went to the equator, on The first measurements of gravity insite of todays Sydney Opera House. and as far from it as Alaska), and no use at Australia, which was published on-lineall for anything else.last April, he mentions the visit of theRoger also posed the question What Malaspina expedition to Sydney in 1793happened to these results? And didThe same objection almost certainly would and noted that It is presumed thatthey include determinations of gravity?,have applied to the results obtained on Malaspina had swung a pendulum there. and once again the question is easilythe La Prouse expedition, but those, answered. The gravity results were setagain almost certainly, the first gravity There is actually no need for anyout and discussed in Appendix III of Josefmeasurements to be made in Australia, presumption, because MalspinaEspinosa y Tellos Memorias sobre laswere lost when the ships of the expedition himself noted in Volume III of hisObervaciones Astronomicas, hechas por loswere wrecked on Vanikoro. There were diary (translated into English by JohnNavegantes Espaoles en Distintos Lugaresno survivors. The measurements made Dunmore and published by the Hakluytdel Globo. Unfortunately, the descriptionsby Dawes not only preceded those by Society in 2004) that by the 25th reveal that the accuracy was very lowMalaspina but were much more accurate, the most detailed experiments hadindeed, because the measurementsbecause Dawes measured the timing been carried out with the pendulumwere made by counting the numbererror of a pendulum clock, which could be (p.73). The site was also specified. Itof full oscillations of the pendulum inobserved for days on end.was not at the observatory that hadone hour. Since this pendulum made been established by William Dawes,3609 oscillations in one hour at theRegardsthe colonys astronomer, where heequator and there is no suggestion had measured gravity in 1788 but, forof fractional swings being recorded, aJohn Milsom security reasons on a point one and aone-oscillation error would produce angladassoc@btinternet.com1 PREVIEW DECEMBER 2021'