What is different between a Astrolabe , Clinometers , Sextant,? Bubble Sextant and Transit/Theodolite.
?
1) Astrolabe , Clinometers is?basically a plumb and a protractor?apx ?¡ã some are deviations ?¡ã and you slip to ?¡ã [15 minutes] readings.
?
?
?
This the lowest cost a protractor from dollar store and strar with string and old rusty nut for plumb bob
?
Other low cost Clinometer
More common type use primary on trees
The is call a Clinometer but also could be a Astrolabe or Sextant
Low accrucy
High end Clinometers with range finder
?
?
?
2) Sextant?measures angles between two objects typically the horizon and Sun or Stars 6 minutes to 20 seconds?
Use veneer or a worm gear.?
?
?
Very costly use on Large Ships
?
?
Small size for lifeboats and practise
?
?
3) Bubble Sextant?Use a bubble level because the horizon is not a option? 6 minutes to 20 seconds. Use veneer or a worm gear.
?
4) Transit/Theodolite?use a bubble level but can measure the angle between two objects 30 seconds for Transit and Theodolite is 20 seconds to 5 seconds only uses a veneer for greater accuracy ,? except for electronic type.?
?
This is a Transit and also call a Theodolite?
?
A Theodolite has to be accurate to 20 minutes and the telescope rotat 360¡ã This photo shows the 360 has all spec for a Theodolite too.
?
?
This the one use for testing machine tool accrucy like rotary tables and deciding heads. This sitting on my work bench last month.??
?
The veneer graduate to 20 seconds
?
The sextant and Transit/Theodolite. has a lot uses beyond the building or navigation.? Just one is in machine tools for testing and settup.
FAB WORK ON LARGE PARTS OVER 50 FOOT?
?
Dave
davesmith1800
