This two volume pair " Amateur Telescope Making Volume one 1957 " and it's sequel " Amateur Telescope Making Advanced 1937 " by Scientific American.
These books will give you all the information on how to grind and polish glass lenses... This is useful information in case you would attemt to restore a scratched or broken lens ...These books are on Telescopes but all information would apply directly to grinding and polishing a camera lens as well....
A lot of interesting old pictures and machines ....Mostley geared for the amatuer and how to do it in your basement...
Price $25 for pair.... Shipping $5.00 media mail lower 48 states..
As with every thing I sell this is sold as is..
John Cremati
johnjohnc@att.net My Pay Pal is the same as my email... Please add $3 if paying by Pay Pal to cover the fees....There is a way to get around the fees but I do not know how to instruct you on this...