shields

Tagged Discussions

Beginning My Study Of Heraldry

Arthur Chappell @arthurchappell (44941) • Preston, England 2 Jan 18

My passion for pub signs has inspired my interest in heraldic shields, and coats-of-arms. Many signs depict coats-of-arms for particular professions, individuals or towns associated with the public houses. I bought a few books...

4 responses •

4 people

Radiation Shields and Ion Drives

ready2earn @ready2earn (435) • Italy 17 Dec 06

Could Ion Drive technology be the key to radiation shielding, while at the same time improving ion drive efficiency? The standard ion drive has a stage of operation where it collects excess electrons and injects them into the...