Artificial Horizon
notes: label: Description
content: Navigators using a sextant might use an artificial horizon when the natural horizon is not easily seen. Artificial horizons employing a flat piece of black glass came into use in England in the early nineteenth century. This example is unsigned.
label: Description
content: Ref: William Pearson, An Introduction to Practical Astronomy (London, 1829), p. 295 and pl. XXIX.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ZZ.RSN79601Z19
objectType: label: Object Name
content: reflecting horizon
physicalDescription: label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 2.3 cm x 12 cm x 11 cm; 29/32 in x 4 23/32 in x 4 11/32 in
label: Measurements
content: overall: 1 in x 4 1/2 in x 4 1/2 in; 2.54 cm x 11.43 cm x 11.43 cm