Category: Engineering & Technology
Of the various forms of Telescopes now in use, each has its own peculiar advantages; but the Silvered-Glass Reflector is undoubtedly gaining favour among our practical observers. A well-figured speculum, being perfectly free from chromatic aberration, gives, in a proper condit...
After the polish is _perfect_ remove the plate from the support and cut into squares a little larger than the size of the intended flat. Test these in the telescope on a _star_....
1. Part 1Of the various forms of Telescopes now in use, each has its own peculiar advantages; but the Silvered-Glass Reflector is undoubtedly gaining favour among our practical observers...
3. Part 3When in perfect adjustment the large mirror viewed through the “adjusting piece” should appear as before stated, as a complete bright circle, with the image of the “flat” as a s...
4. Part 4DEAR SIR,—I have been wishing to tell you how pleased I am at the performance of your mirror. Many thanks for your kind offer to change the mirror if needful, but I think it cou...
7. Part 7Last night, at 14^h 30^m, I had my first peep at Jupiter through it, and a grand sight it was; his belts coloured, though not so vivid as they are sometimes, were fine in the ex...
6. Part 6DEAR SIR,—I have found no difficulty in putting up the instrument, and the adjustments do not appear to be hard to manage. It is a very beautiful instrument, and the case with w...
5. Part 5These considerations will explain the occasional use of stops, and the expediency of having them ready to use when they can be of temporary advantage. There are nights in our cl...
8. Part 8MY DEAR SIR,—I can scarcely express to you the pleasure I have had in the use of your splendid 6-1/2 in. mirror. Both in light grasping power, and in the separation of close dou...