On a moveable horizontal sun-dial, which shows apparent solar time within a small fraction of a minute.

Sonraí bibleagrafaíochta
Príomhchruthaitheoir: Donovan, Michael
Citation:Proceedings of the Royal Irish Academy, Ser. 1, Vol. VI, p. 491, 1853-7
Formáid: Journal Article
Foilsithe / Cruthaithe: 1853-7
Ábhair: