’Inquisitive scientific travellers have long depended on robustly reliable hardware to turn their remarkable experiences into convincing reports. This impressive collection makes sense of how such devices work and offers a major challenge to images of the solitary voyagers of past sciences. The book is stocked with revealing stories of these mobile instruments' very wide range of uses, tales of frustration and improvisation as well as of triumph and success.’ Simon Schaffer, University of Cambridge, UK ’The story of scientific exploration has often been reduced to the heroism, or duplicity, of explorers. In this book, it is instead the instruments of science that are centre-stage, from the humble compass to the space-age rocket. Through a variety of studies of technology, both as used and as imagined, this book opens a new chapter in the historical geography of science.’ Felix Driver, Royal Holloway, University of London, UK ’Traditional histories of scientific exploration are typically only about humans; their often epic bodily exertions, and mental breakthroughs. This excellent collection of essays rightly shifts the emphasis to the role of material things: devices, instruments, machines, tools, books of tables, photos, and clothing. None are mere background props. Instead, they are the very stuff of scientific exploration.’ Trevor Barnes, University of British Columbia, Canada