The '47 manual is great - from my position of relative ignorance I've assumed the 40's were a time of standardisation in bike design and not much changed for another 40 years.
30's and early 40's are comparitively full of variation - I remember phoning Chris Grange for some clip-headset spares and the available variations blew my mind, there were 3 different fork steerer pitches iirc and that's before you even start on bearing race diameters....
The '47 manual is great - from my position of relative ignorance I've assumed the 40's were a time of standardisation in bike design and not much changed for another 40 years.
30's and early 40's are comparitively full of variation - I remember phoning Chris Grange for some clip-headset spares and the available variations blew my mind, there were 3 different fork steerer pitches iirc and that's before you even start on bearing race diameters....