[ATM] Pictures

[Anthony Stillman <atmer@flash.net>]

At the attached addresses are images of my most recent speculum metal
mirror failures.

First 90 mm casting.   The casting investment vented steam through the
liquid metal.  Like visiting "Yellow Stone", on Io.  One of these vents,
split in two,  is visible on the right two pieces.
<http://www.atmlist.net/contrib/atmer-at-flash-dot-net/Vented.jpg>

Second 90mm blank.  Broken while using an every so slightly unbalanced 220
grit grinding wheel to smooth the curve roughed in by a balanced 100 grit
grinding wheel.
<http://www.atmlist.net/contrib/atmer-at-flash-dot-net/Broken.jpg>

Close up of the second blank's broken face.
<http://www.atmlist.net/contrib/atmer-at-flash-dot-net/CloseUp.jpg>



Anthony


cives censent, servi non facent


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