My collection of astronomical and mathematical instruments
My collection of navigational instruments
- Sextant SNO-T
Made in USSR in 1990; possibly the last year when they were produced.
(The Russian abbreviature means "Sextant for navigation,
with illuminatsion-tropicalized".
It is a development of Freiberger drum sextant, made of duralumin alloy.
Has two telescopes: Kepler (inverting) daytime and Galileo night scope.
- Pocket sextant
by Troughton and Simms,
probably 19th century (The design did not change since the beginning of
19th century to the end of production). The silver scale with vernier
reads to 1 minute. This one is surprisingly accurate: it
really measures the star altitudes with 1' accuracy.
No index error, no adjustments required. Has two Sun filters, a 2x telescope
and a peep sight.
Another view.
- Bris sextant next to a Freiberger compass
- Kavrajski's dipmeter.
A very rare device
to measure the dip of the horizon. Produced in USSR in the 1970s.
Another view. It measures the dip
by sighting two psarts of the horizon 180 degrees apart.
- Chronometer "Poljot"",
Kirov factory, 1985.
Another view
- Deck watch Moscow watch factory.
Another view.
-
Celestial globe. Soviet, 1960.
-
Three-armed protractor, a. k. a.
station pointer. Finds the
position of a ship on a map from two horizontal angles between three objectss
on shore.
Angles are set by drums with 1' accuracy.
Another view.
-
A simple stadimeter. Finds the distane to an object of known height.
-
Three compasses. One-handed
(reproduction of a classic desigh), modern one (also easy to operate with one hand), and proportional compass.
- Lasico planimeter
These devices integrate a 1-form along a closed curve to find the area
of the enclosed region. They were mainly used by termodynamic calculations,
for example to find the work from the PV-diagram of a cycle.
Another photo.
- Keuffel and Esser planimeter.
- Draughtsman's set.
