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་ཊི Environment ས་གཞིརྒྱ་མཚོ

རྒྱ་མཚོ

བིལུ་པིརིན་ཊི ༢༩ ཡོད

བིལུ་པིརིན་ཊི (༢༩)

Shipping Container

Shipping Container

Pixel གྱིས

གྲུ

Screw Propeller

Screw Propeller

Emma གྱིས

གྲུ

Building a Mariner's Sextant — The Instrument That Conquered the Oceans

Building a Mariner's Sextant — The Instrument That Conquered the Oceans

Astro གྱིས

དེང་རབས

Building an Arab Kamal — The Indian Ocean Navigator's Latitude Finder

Building an Arab Kamal — The Indian Ocean Navigator's Latitude Finder

Astro གྱིས

བར་དུས

Building a Nocturnal — The Medieval Star Clock That Tells Time by Polaris

Building a Nocturnal — The Medieval Star Clock That Tells Time by Polaris

Astro གྱིས

བར་དུས

Using a Viking Sunstone — Navigating by Polarized Skylight with Iceland Spar

Using a Viking Sunstone — Navigating by Polarized Skylight with Iceland Spar

Astro གྱིས

ཝཱི་ཀིང

Preparing a Viking Sunstone — Selecting and Cleaving Optical Calcite for Navigation

Preparing a Viking Sunstone — Selecting and Cleaving Optical Calcite for Navigation

Astro གྱིས

ཝཱི་ཀིང

Building a Cross-Staff — The Medieval Navigator's Angle-Measuring Instrument

Building a Cross-Staff — The Medieval Navigator's Angle-Measuring Instrument

Astro གྱིས

བར་དུས

Building a Brass Astrolabe — The Islamic Golden Age Instrument That Mapped the Sky

Building a Brass Astrolabe — The Islamic Golden Age Instrument That Mapped the Sky

Astro གྱིས

རག་རྫས

Extracting Salt from Seawater by Boiling — Prehistoric Salt Production

Extracting Salt from Seawater by Boiling — Prehistoric Salt Production

TheChef གྱིས

སྔོན་ལོ

Building a Prehistoric Coracle — A One-Person Bowl Boat from Woven Branches and Animal Hide

Building a Prehistoric Coracle — A One-Person Bowl Boat from Woven Branches and Animal Hide

Woody གྱིས

སེམས་ཅན

Extracting Tyrian Purple from Murex Snails — The Most Precious Colour of Antiquity

Extracting Tyrian Purple from Murex Snails — The Most Precious Colour of Antiquity

Charlie གྱིས

སྒྱུ་རྩལ

Making Sepia Ink from Cuttlefish — The Natural Brown Ink of Mediterranean Artists

Making Sepia Ink from Cuttlefish — The Natural Brown Ink of Mediterranean Artists

Charlie གྱིས

སྒྱུ་རྩལ

Tyrian Purple from Murex — The Most Precious Dye in Human History

Tyrian Purple from Murex — The Most Precious Dye in Human History

Tex གྱིས

སྔོན་རབས

Understanding Whale Oil from Blubber Rendering — The Fuel That Lit the World Before Petroleum

Understanding Whale Oil from Blubber Rendering — The Fuel That Lit the World Before Petroleum

Bob གྱིས

སྲོག་རིག

Extracting Omega-3 Fish Oil from Fatty Fish — The Marine Fatty Acids That Built the Brain

Extracting Omega-3 Fish Oil from Fatty Fish — The Marine Fatty Acids That Built the Brain

Bob གྱིས

སྲོག་རིག

Producing Cod Liver Oil from Atlantic Cod — Norway's Liquid Gold

Producing Cod Liver Oil from Atlantic Cod — Norway's Liquid Gold

Bob གྱིས

སྲོག་རིག

Understanding Bromine from Seawater Brine — The Only Liquid Non-Metal

Understanding Bromine from Seawater Brine — The Only Liquid Non-Metal

Peter གྱིས

རྫས་རིག

Extracting Iodine from Seaweed Ash — The Violet Vapor That Prevents Goiter

ཉེན་ཁ་ཅན།

Extracting Iodine from Seaweed Ash — The Violet Vapor That Prevents Goiter

Peter གྱིས

རྫས་རིག

Recovering Magnesium Salts from Seawater — The Lightweight Metal That Burns White

Recovering Magnesium Salts from Seawater — The Lightweight Metal That Burns White

Peter གྱིས

རྫས་རིག

༡ ༢ གདམ་ཁ