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Group Information

  • Members: 1255
  • Category: Telescopes
  • Founded: Jun 1, 2002
  • Language: English
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Activity within 7 days:

33 New Messages - 8 New Photos - New Questions

Description

This Group is for the FREE exchange of ideas related to Amateur Telescope Making (ATM).

Have fun, be kind, play fair, learn, teach, participate.

PHOTO... Here's a contributed photo of a simply constructed Mirror Test Stand from "Mendogrowcon". The full size photo can be viewed by ATM_FREE members in the "Photos" section. Check out the ATM_FREE Group's discussion for more info on this Mirror Test Stand and other things we are doing.

Ken Hunter

Most Recent Messages

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Re: Whatever,,,
Who is Lizard Boy? To: atm_free@yahoogroups.com From: nss@... Date: Wed, 25 Nov 2009 18:02:56 -0600 Subject: [atm_free] Whatever,,, Whatever Became of
Posted - Thu Nov 26, 2009 5:55 pm
 Astronomer Bilal
astronomerbi...
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Re: I have a Spherometer and i have no clue how to use it.
The actual formula you want to use for the spherometer reading, s, is: s = R - sqrt(R^2-r^2) Where sqrt indicates the square root of the quantity inside the
Posted - Thu Nov 26, 2009 5:08 pm
 Joseph Johnson
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Re: I have a Spherometer and i have no clue how to use it.
Ok the Spherometer i bought is from 1800 destiny company . It was 85.00 and it is analog style.. It has 3 nuts on the bottom that can be adjusted .. also i
Posted - Thu Nov 26, 2009 3:39 pm
 Louis Del Sesto
faintfuzzies1
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Re: I have a Spherometer and i have no clue how to use it.
Just a small comment on theme. ... The ring has two radii. Outer and inner. For measuring concave surface r is radius of outer ring while for measurement of
Posted - Thu Nov 26, 2009 12:05 pm
 Vladimir Galogaza
vgalogaza
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Re: I have a Spherometer and i have no clue how to use it.
To add a bit : If it has a round base with a sharp edge that touches the mirror surface, it is a ring spherometer. It has capability to measure radius of
Posted - Thu Nov 26, 2009 11:55 am
 deepakd
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2009 86 282 288 223 222 71 119 141 55 241 129
2008 153 124 150 117 47 273 170 77 58 114 99 65
2007 144 177 110 111 66 23 80 99 87 50 96 110
2006 131 307 134 228 500 108 315 129 216 165 213 209
2005 339 369 319 91 234 460 136 153 168 57 292 107
2004 167 150 134 120 84 96 48 55 114 158 305 374
2003 96 103 135 158 179 93 84 158 168 178 284 160
2002 252 209 313 184 198 113 141
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