Test 1: Comparison of the high magnification images in daylight; conducted August 21 2018. Both telescopes were set up on their mounts (the reflector was mounted on a simple Vixen Porta II alt-azimuth) during a warm, overcast day and the instruments charged with a high magnification (~ 50x per inch).
The Content - It's not just about batteries. Scroll down and see what treasures you can discover. Background. We think of a battery today as a source of portable power, but it is no exaggeration to say that the battery is one of the most important inventions in the history of mankind.
Cliches and expressions give us many wonderful figures of speech and words in the English language, as they evolve via use and mis-use alike. Many cliches and expressions - and words - have fascinating and surprising origins, and many popular assumptions about meanings and derivations are mistaken.
Aircraft terminology. Information on aircraft gives the type, and if available, the serial number of the operator in italics, the constructors number, also known as the manufacturer's serial number (c/n), exterior codes in apostrophes, nicknames (if any) in quotation marks, flight callsign in italics, and operating units.