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Guglielmo (The 1st Marquis) Marconi; ’Blattnerphone’ Redesign. The BBC required a fast run-up time, a direct motor drive, quieter running and high speed rewind design upgrade for it’s famous Blattnerphone (an early reel to reel recorder), Marconi was to be responsible for the mechanical design of the system and the BBC Research Department for the electronics. Marconi isolated the constant speed drive from the spools by adding a tape reservoir either side of the drive. The...


Drywall Taping Tips

Follow these 12 pro drywall-taping tips to improve your skills, speed up the job and result in smoother walls. They include mixing, knife techniques and problems to avoid.