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Title: Thomas Burnet - fig 3 to Sacred Theory of the Earth
Format: photograph: negative
Date: 1684
Description: Burnet’s “general idea” of the primeval Earth: “Because it pleaseth more, and makes a greater impression on us, to see things represented to the Eye, than to read their description in words, we have ventur’d to give a model of the Primaeval Earth, with its Zones or greater Climates, and the general order and tracts of its Rivers ...”

Title: Westminster Hall
Format: photograph: negative
Date: 1809
Description: Ackermann, R., The Microcosm of London, Vol. III, London 1809-1810 Plate no. 94

Title: St. Margarets. Westminster
Format: photograph: negative
Date: 1809
Description: Ackermann, R., The Microcosm of London, Vol. III, London 1809-1810 Plate no. 78

Title: Perseus
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: William Whiston - fig.9 for A New Theory of the Earth (London, 5th edn., 1737)
Format: photograph: negative
Date: 1737
Description: Whiston’s representation of the solar system, including a prominent comet. Newton and Edmond Halley had worked hard to demonstrate that comets were predictable, periodic bodies which therefore could not be used to prognosticate divine interventions in the natural order. Yet they also suggested that comets deposited aethers to revitalize a spiritually depleted Earth. Whiston liked this mixture of close geometrical analysis with divine mechanism, and extended the discussion. He argued that comets had been responsible for key moments in the Earth’s natural and biblical history - for instance, it was a great comet that had caused the Deluge. He even equated comets with Hell: as they moved in their highly eccentric orbits, they alternated between the “Darkness of Torment” and the “ungodly Smoak of Fire.” For Whiston, comets thus became “the place of Punishment for wicked Men after the general Resurrection.”

Title: New Stock Exchange
Format: photograph: negative
Date: 1809
Description: Ackermann, R., The Microcosm of London, Vol. III, London 1809-1810 Plate no. 75

Title: Hydra
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Galileo, illustration from Discorsi e Dimostrazioni Matematiche (Discourses and Mathematical Demonstrations concerning the Two New Sciences of Mechanics and Local Motions), Leiden, 1638
Format: photograph: negative
Date: 1638
Description: The illustration is from the second day of Galileo’s Discourses, and shows that the resistance of a solid body to breaking is dependent upon its length and thickness.

Title: Corona Merionalis
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Cancer
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Leo
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Pscis Notius
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Great steel quadrant confined in a square and standing on an azimuth horizon of steel, from Tycho Brahe, Astronomiae Instauratae Mechanica
Format: photograph: negative
Date: 1602

Title: Vauxhall Garden
Format: photograph: negative
Date: 1809
Description: Ackermann, R., The Microcosm of London, Vol. III, London 1809-1810 Plate no. 88

Title: Sagittarius
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Crater
Format: print: engraving
Date: 1603
Description: From Johann Bayer’s “Uranometria” (1603), the first ‘true’ star-atlas. This and other copper-engraved images from the book demonstrate a notable feature of this atlas: the sheer beauty of the plates. Alexander Mair, the artist, clearly found some inspiration in the De Gheyn engravings in the Aratea published by Hugo Grotius in 1600, but most of Bayer’s constellation figures have no known prototype. Significantly, each plate has a carefully engraved grid, so that star positions can be read off to fractions of a degree. These positions were taken, not from Ptolemy’s catalog, but from the catalog of Tycho Brahe, which had circulated in manuscript in the 1590s, yet not printed until 1602. Another important feature of the atlas was the introduction of a new system of stellar nomenclature, Bayer assigning Greek letters to the brighter stars, generally in the order of magnitude.

Title: Watch House
Format: photograph: negative
Date: 1809
Description: Ackermann, R., The Microcosm of London, Vol. III, London 1809-1810 Plate no. 91

Title: Cassini’s heliometer
Format: photograph: print
Date: 1695
Description: The church of San Petronio in Bologna was the site of a solar observatory as early as 1576 when Egnazio Danti, cosmographer to Cosimo I de’ Medici, installed the first meridian line there. Unfortunately it did not fulfill its purpose, which was to provide an accurate date for the spring equinox, thence Easter. In spite of uncertainties about the precise length of the solar year, the Gregorian calendar was promulgated anyway, in 1582. We still use it today. Almost 75 years later, the opportunity arose to reconstruct the meridian. Enter a 29-year-old astronomy professor named Giovanni Domenico Cassini. Cassini increased the height of Danti’s solar peephole—or gnomon hole—to 1000 inches (based on the French foot) or 27.07 meters above the church floor. The length of the meridian line was increased by x2.5 to 66.71 meters, or 1/600,000 of the Earth’s circumference, per Cassini’s calculation. The line had to run on the floor between the aisles and columns of the church on a north-south axis without obstruction. The instrument was tested with great fanfare at the summer solstice of 1655 and proved fully successful. Cassini’s illustrated account of his heliometer was published 40 years later in 1695 with the title La Meridiana del tempio di S. Petronio. The image shown here is taken from a large foldout plate depicting the design and details of installation.

Title: Zodiacal armillary instrument, from Tycho Brahe, Astronomiae Instauratae Mechanica
Format: photograph: negative
Date: 1602

Title: Antoni van Leeuwenhoek (1632-1723)
Format: photograph: negative
Date: 1684
Description: Portrait from volume two of his four-volume Werken, published in 1689. Leeuwenhoek was the son of a middle-class shopkeeper in Delft, Netherlands. He began his professional life as a cloth merchant and then served in several civil service posts in Delft. As the Court Surveyor of Holland, he acquired an interest in lens grinding and fashioned his first microscope in 1671. He communicated his observations to other scientific practitioners in letters written in Dutch that were later collected together and published in four volumes