Early "AO Lensometer"
related measuring devices
Note "Lensometer" was an AO Trademark name

1912 AO Book

AO 1912 Book page showing Lens Centering Device (pdf of above)
 

The pages below are from a 1935 AO Machinery Catalogue,
but believe they predate the Lensometer

AO Lens Marking Device (at left) - pdf download
 

AO Axometer Device - pdf download

AO Lens Centering Device - pdf download

The AO Lensometer
Note "Lensometer" was an AO Trademark name

May 2009 Lensometer Display (courtesy of the Optical Heritage Museum)
at the Southbridge Hotel and Conference Center. See the AO Lens Marking unit at the very left of the display.