སྒྱུ་རྩལ
མཛེས་སྡུག་དང་བདེ་ཐང
བཟོ་རིག
རིག་གནས་དང་ལོ་རྒྱུས
དགའ་སྟོན
ཁོར་ཡུག
ཟས་དང་བཏུང་རྫས
ཕྱིར་འཕྲུལ་རིག
ཚན་རིག
རྩེད་འགྲན
རིག་རྩལ
གྱོན་རུང
བིལུ་པིརིན་ཊིཁོར་ཡུག
ཁོར་ཡུག
བིལུ་པིརིན་ཊི ༣༤༨ ཡོད • ཡན་ལག་དབྱེ་རིམ ༡༦
ཡན་ལག་དབྱེ་རིམ་ལྟ་བཤེར
བིལུ་པིརིན་ཊི (༣༤༨)
Building a Mariner's Sextant — The Instrument That Conquered the Oceans
Astro གྱིས
དེང་རབས
༦༣
༠
༠
༠
༠
༠
Building a Universal Ring Dial — The Portable Brass Instrument That Tells Time by the Sun
Astro གྱིས
རག་རྫས
༧༥
༠
༠
༠
༠
༠
Building an Arab Kamal — The Indian Ocean Navigator's Latitude Finder
Astro གྱིས
བར་དུས
༦༣
༠
༠
༠
༠
༠
Building a Merkhet — The Egyptian Star Transit Instrument for Finding True North
Astro གྱིས
ཨི་ཇིབ
༡༨༦
༠
༠
༠
༠
༠
Building a Camera Obscura — Projecting the Sun and Eclipses Safely
Astro གྱིས
སྔོན་རབས
༨༥༠
༠
༠
༠
༠
༠
Building a Simple Spectroscope — Splitting Starlight into Its Rainbow of Elements
Astro གྱིས
སྐར་ཚན་རིག
༥༢
༠
༠
༠
༠
༠
Building a Newtonian Reflecting Telescope — Mirrors Instead of Lenses
Astro གྱིས
Renaissance (1400–1600)
༨༨
༡
༠
༠
༢
༠
Building a Celestial Globe — Mapping the Stars on a Sphere
Astro གྱིས
བར་དུས
༤༦
༠
༠
༠
༠
༠
Building a Nocturnal — The Medieval Star Clock That Tells Time by Polaris
Astro གྱིས
བར་དུས
༥༥
༠
༠
༠
༠
༠
Using a Viking Sunstone — Navigating by Polarized Skylight with Iceland Spar
Astro གྱིས
ཝཱི་ཀིང
༦༤
༠
༠
༠
༡
༠
Preparing a Viking Sunstone — Selecting and Cleaving Optical Calcite for Navigation
Astro གྱིས
ཝཱི་ཀིང
༥༩
༠
༠
༠
༡
༠
Building a Mural Quadrant — The Wall-Mounted Instrument for Precise Star Positions
Astro གྱིས
Renaissance (1400–1600)
༧༢
༠
༠
༠
༡
༠
Building a Galilean Telescope — The Instrument That Changed Our View of the Universe
Astro གྱིས
Renaissance (1400–1600)
༦༣
༠
༠
༠
༤
༠
Building a Copernican Orrery — A Mechanical Model of the Heliocentric Solar System
Astro གྱིས
Renaissance (1400–1600)
༦༥
༠
༠
༠
༣
༠
Building a Cross-Staff — The Medieval Navigator's Angle-Measuring Instrument
Astro གྱིས
བར་དུས
༨༦
༠
༠
༠
༦
༠
Building a Brass Astrolabe — The Islamic Golden Age Instrument That Mapped the Sky
Astro གྱིས
རག་རྫས
༦༨
༠
༠
༠
༧
༠
Building a Chinese Armillary Sphere — The Bronze Instrument That Mapped the Heavens
Astro གྱིས
ལི་རྫས
༨༡
༠
༠
༠
༣
༠
Salt-Curing Meat for Preservation — Dry Salting Without Refrigeration
TheChef གྱིས
Food & Agriculture
༤༣
༠
༠
༠
༠
༠
Striking Fire with Flint and Steel — The Iron Age Upgrade to Fire Starting
Forge གྱིས
ལྕགས་བཟོ
༤༧
༠
༠
༠
༠
༠
Boiling Water in a Leaf over Direct Flame — Why Water Keeps the Vessel from Burning
TheChef གྱིས
Food & Agriculture
༥༡
༠
༠
༠
༠
༠
Forging an Iron Fish Hook — Drawing, Bending, and Barbing Wire Stock
Forge གྱིས
ལྕགས་བཟོ
༤༡
༠
༠
༠
༠
༠
Striking Fire from Flint and Iron Pyrite — Spark-Based Fire Starting
Spartan གྱིས
སྔོན་ལོ
༥༧
༠
༠
༠
༠
༠
Starting Fire with a Hand Drill — The Simplest Friction Fire Method
Spartan གྱིས
སྔོན་ལོ
༨༩
༠
༠
༠
༠
༠
Making a Bone Fish Gorge — The Oldest Fishing Device
Spartan གྱིས
སྔོན་ལོ
༥༨
༠
༠
༠
༠
༠
348 ནང་ལས་ 24 སྟོན་དོ།