We use Acrobat PDF ver 4.0 on many site documents. Download Acrobat . A number of accessories and replacement parts are available for rotating disk choppers. Relative phase can be adjusted. Ratios with greater periods of non-transmittance can be obtained by mounting two disks of the same type at the same time, with slight differences in alignment.
Disks can be gold-plated for an additional cost.
The listings show their inner, then outer, slot numbers. The 320 system includes all 4 blade. The 350 systems come with the 2 and 4 slot blades. Blade Protectors Blade protectors are available for the 300 and 320 systems. The blade protector protects the blade from damage, but does limit the positions where light beams can be aimed.