མཛེས་སྡུག་དང་བདེ་ཐང

རིག་གནས་དང་ལོ་རྒྱུས

ཟས་དང་བཏུང་རྫས

ཕྱིར་འཕྲུལ་རིག

བཟོ་གྲྭ

བིལུ་པིརིན་ཊི ༤༤༢ ཡོད

བིལུ་པིརིན་ཊི (༤༤༢)

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

Charlie གྱིས

442 ནང་ལས་ 24 སྟོན་དོ།

བཟོ་གྲྭ

བིལུ་པིརིན་ཊི (༤༤༢)

Reduced Iron: Iron Oxide Heated in Hydrogen, USP 1860

Subcarbonate of Iron: Iron Sulfate and Soda Crystals, USP 1860

Nitric Acid: Chile Saltpetre Distilled with Oil of Vitriol in an Iron Retort

Oxalic Acid: Wood Soaked in Caustic Alkali and Heated in Hot Air at 300 °C (Plater-Syberg)

Oxalic Acid: Sawdust Heated with Alkali Lye in Vacuum, Oxidised, Precipitated as Calcium Oxalate (Zacher)

Diethyl Ether: Soubeiran's One-Operation Still with a Caustic Charcoal Purifier

Urea: Extracted from Urine with Alcohol, Precipitated as the Nitrate, Freed with Barium Carbonate

Urea: Separated from Urine as the Oxalate, Freed with Chalk and Crystallised

Ferrite Toroid Core: Copper-Zinc Ferrite Milled 200 Hours, Fired at 1050 °C (Snoek)

Ferrite Toroid Core: Magnesium-Zinc Ferrite (28 : 18 : 54) Fired at 1400 °C (Snoek)

Ferrite Toroid Core: Nickel-Zinc Ferrite Fired at 1400 °C, Held at 930 °C (Snoek)

Ferrite Toroid Core: Copper-Zinc Ferrite Fired at 1050 °C, Held at 600 °C in Oxygen (Snoek)

Ferrite Toroid Core: Magnesium-Zinc Ferrite Fired at 1300 °C in Oxygen (Snoek)

Ferrite Toroid Core: Magnesium-Zinc Ferrite Fired at 1400 °C in Oxygen (Snoek)

Laminated Phenolic Paper Sheet: Bakelite-Coated Kraft Paper Hot-Pressed and Baked (O'Conor, Westinghouse 1918)

Liquid Bakelite: Phenol and Formalin Heated Together, the Oily Layer Kept (Baekeland 1909)

Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)

Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Acetic acid

Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Acetone

Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Isopropanol

Acrylic Mirror Sheet: Silver Sprayed on Acrylic Treated with Tannin in Water and Methanol

Diethyl Ether: Alcohol Dropped into Sulphuric Acid at 130–140 °C (Boullay's Continuous Method)

Tannic Acid: Galls Stirred to a Cream with Ether and Pressed (Leconnet)

Tannic Acid: Powdered Galls Extracted with Ether and Alcohol (75:25)