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astronomical instruments.

Astronomical observations

By Gordon Arthur Hunter Walker,Gordon Walker

Observations on the superiority of achromatic telescopes with fluid object-glasses

By

Notice respecting Professor Barlow's new achromatic telescopes with fluid object-glasses

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Account of a new species of chronometer

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The Dā'ire-yi Mu'addel of Seydī 'Ali Re'īs

By William Charles Brice

The Planetary equatorium of Jamshid Ghiyath al-Din al-Kashi (d. 1429)

By

Optical astronomy

By