Use of Transit for machine tools and the difference
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What is different between a Astrolabe , Clinometers , Sextant,? Bubble Sextant and Transit/Theodolite.
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1) Astrolabe , Clinometers is?basically a plumb and a protractor?apx ?¡ã some are deviations ?¡ã and you slip to ?¡ã [15 minutes] readings.
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This the lowest cost a protractor from dollar store and strar with string and old rusty nut for plumb bob
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High end Clinometers with range finder
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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.?
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Very costly use on Large Ships
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Small size for lifeboats and practise
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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.
 
 
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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.?
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This is a Transit and also call a Theodolite?
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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.
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This the one use for testing machine tool accrucy like rotary tables and deciding heads. This sitting on my work bench last month.??
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The veneer graduate to 20 seconds
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The sextant and Transit/Theodolite. has a lot uses beyond the building or navigation.? Just one is in machine tools for testing and settup.
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Dave
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davesmith1800