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Janus Series
Slide rule
Navigators dual face slide rule (N.52) Janus Series.
White plastic rule with perspex cursor.
On the face of the rule are four logarithmic scales A B C & D. These are divided primarily into whole numbers and subdivided into 1/10s and 1/100s as space permits. Also on the face are trigometrical scales of sines, tangents and cosines. On the reverse of the rule are scales for finding true altitude, density altitude, true air speed and for converting Farenheit to Centigrade and nautical miles to statute miles and kilometres.
Navigators dual face slide rule (N.52) Janus Series.
White plastic rule with perspex cursor.
On the face of the rule are four logarithmic scales A B C & D. These are divided primarily into whole numbers and subdivided into 1/10s and 1/100s as space permits. Also on the face are trigometrical scales of sines, tangents and cosines. On the reverse of the rule are scales for finding true altitude, density altitude, true air speed and for converting Farenheit to Centigrade and nautical miles to statute miles and kilometres.
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Object Details
| ID: | NAV0187 |
|---|---|
| Type: | Slide rule |
| Display location: | Not on display |
| Creator: | Blundell Rules Ltd |
| Date made: | circa 1961 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 7 mm x 328 mm x 66 mm |
| Parts: | Janus Series |