Amazon.com: Original Tesla Patent Art Prints - Set of Four Photos (8x10) Unframed: Handmade

Six Barracuda nuclear-powered attack submarines are to be built for the French Navy. The Barracuda Class is being introduced to replace the existing force of the four SSN Rubis submarines which entered service from 1983 to 1988 and the two SSN Amethyste Class submarines which entered service in 1992 and 1993. The Barracuda missions include anti-surface and…

Build a Microscope!: This microscope can be made in a few hours. It is cheap and nice (not a toy)!Possible magnification range: 10-100x (dependent on objective lenses)Materials:discarded photo enlarger8 X 21 mm binocularsome pieces of scrap woodOptional: some discarded …

In a properly focused and aligned optical microscope, a review of the geometrical properties of the optical train demonstrates that there are two sets of principal conjugate focal planes that occur along the optical path through the microscope. This section discusses these focal planes and how they interact to illuminate the specimen and form an image.

Page 1 of 14 - FCT150 and Custom made 150mm refractor comparison - posted in Refractors : Hi,   Last night I went to my friends home to compare my old Takahashi FCT-150 and his custom made 150mm refractor. My FCT-150 had been at Takahashi factory from 25th Desember last year, to re-adjusting and  cleaning optic. I was so busy to do my hobby, I asked Takahashi to delay the return. I asked Takahashi optic designer Mr.Yuyama as these.   1. reduce under correction 2. reduce red...