In many prewar schematics, the "M" after a value indicates 1000. Thus, a 22M resistor would be 22,000 ohms, or 22K in modern terms. For resistors 1 megohm and higher, the word "megohm" is always used; in later schematics, it is usually abbreviated to "meg". If you read the color codes, it will also be a big help. Try this link: http://www.hobby-hour.com/electronics/r ... ulator.php
"Dogbone" types, and the early insulated types used by some manufacturers, use this code:http://www.nostalgiaair.org/References/ ... schart.htm
The colors have the same meaning, but are arranged differently. Dogbones have a dot for the third color, instead of a stripe.
I hope this helps!