Airplanes and Rockets' history & copyright Google search American Modeler Air Trails American Aircraft Modeler Young Men Hobbies Aviation Flying Aces Saturday Evening Post Boys' Life Hobby Distributors Amateur Astronomy Engines & Motors Balsa Densities Silkspan Covering Comics Electronics My Models Model Aircraft Articles Plans Model Boat Articles Plans Model Car Articles Plans Model Train Articles Plans 1941 Crosley 03CB Radio Model helicopter articles & plans Crosswords Model Rocket Articles Plans Restoration Projects Photos Peanuts Collection Model Aircraft Articles Plans Sitemap Homepage Hints and Kinks Amateur Radio Archives of the homepage R/C Modeler Electronics About Airpleans and Rockest, Disclaimer, Terms of Use Model Topics Please Donate to Airplanes and Rockets Parole Plaza, Annapolis, Maryland Hobby Items for Sale Airplanes and Rockets Hero Graphic


Drones - Airplanes and Rockets

Rocket Kits + Accessories - Airplanes and Rockets
Plastic Scale Model Kits - Airplanes and Rockets

How the New 200 Inch Telescope Works
April 1938 Boy's Life

Cover April 1938 Boy's Life - Airplanes & RocketsWe are all acquainted with the common telescope in which a series of lenses is mounted in a long barrel, which can be shortened by sliding the segments together. This is technically known as a refractory type.

In building a giant telescope it is impractical to make a barrel long enough to accommodate the giant lenses. So a system of mirrors is combined with the lenses, and we have what is known as a reflecting telescope. The 200 inch lens of the new telescope described on page 18 is actually a mirror.

Drawing of Hale 200" Telescope in April 1938 Boy's Life - Airplanes & Rockets

Fig. 1 - Drawing of Hale 200" Telescope at Mt. Palomar

At right is reproduced an artist's conception of how it will look set up in the observatory, above is a diagram explaining how it works.

The starlight having entered the open tube is reflected from the 200 inch mirror AA back to a focal point at B. An observer can reach this point of first focus by bridge J (Fig. 2). To send the rays to a second focal observation point D (Figs. 1 and 2) a convex mirror C intercepts the rays from A and B and reflects them down to observation point D, where Fig. 2 shows a platform suspended underneath the 200 inch mirror. The rays arriving at D come through a tube fixed in the center of the mirror. The rays may also be extended from mirror C to E, from E to F, from F to G and from G to H (Fig. 1).

I is another point of focus, and down inside the huge arm (an open section of which is shown) is a chamber for spectographic work. These arms on each side of the tube are parallel to the polar axis. The control board is located at K (Fig. 2). The great housing running at nearly right angles to the telescope is the counter weight to the telescope. It permits the giant apparatus to be moved and aimed With delicate control.

Hale 200" Telescope in April 1938 Boy's Life - Airplanes & Rockets

Figure 2 - Artist's Concept of Hale 200" Telescope at Mt. Palomar

Here is an ad on my RF Cafe website from the May 1948 Saturday Evening Post pitching the 200" Mt. Palomar Telescope Pyrex Mirror Blank by Corning

 

 

Posted May 5, 2012

About Airplanes & Rockets 

Kirt Blattenberger, Webmaster - Airplanes and RocketsKirt Blattenberger

Carpe Diem! (Seize the Day!)

Even during the busiest times of my life I have endeavored to maintain some form of model building activity. This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD ...

Copyright  1996 - 2026

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the Airplanes and Rockets website are hereby acknowledged.

Webmaster:

Kirt Blattenberger

BSEE - KB3UON

Family Websites:

RF Cafe

Equine Kingdom





Plastic Scale Model Kits - Airplanes and Rockets

Academy of Model Aeronautics (AMA) - Airplanes and Rockets

Academy of Model Aeronautics

Tower Hobbies logo - Airplanes and Rockets

Tower Hobbies

Horizon Hobby logo - Airplanes and Rockets

Horizon Hobby

Sig Manufacturing - Airplanes and Rockets

Sig Mfg

Brodak Manufacturing - Airplanes and Rockets

Brodak Mfg