If you are interested in building a color converter and wheel for your B&W TV set, the following will be found a very useful guide. Information on NTSC color converters from 1955 is available by clicking on the links below to the Early Television Foundation Museum website. Examples of both converters in full working condition are on display at the ETF Museum in Hilliard Ohio.
The first is the 'Colordaptor' which was described in a R/E magazine construction article. You had to build the electronic converter and the color wheel from scratch, although the authors made some parts available via mail order.
http://www.earlytelevision.org/colordaptor.html
The second is the Col-R-Tel converter, a complete, ready to install converter chassis and wheel system that sold then for $150.00. It could be installed on a set in an afternoon. Quite a number of these units are still operating today.
http://www.earlytelevision.org/col-r-tel.html
The avitar above is of my Col-R-Tel bought in 1960, restored and installed on a Philco 12 inch 50T-1403 about 3 years ago.
Cliff