Dear All,
Recently I found a small book in a second hand shop called 'SI Units' by
Chiswell and Grigg (John Wiley & Sons 1971).
On skimming through the book I came across this paragraph.
"Since 1841 attempts have been made at various times to get standardisation
in screw threads. At the present time over two hundred thread forms exist
and about ten of these are used frequently."
Can anyone help me with the following questions?
1 What happened in 1841, and who were the main players at that time?
2 What are the two hundred thread forms (that currently) exist?
3 What are the names of the ten of these (that) are used frequently?
Thanks for your help.
Cheers,
Pat Naughtin
CAMS - Certified Advanced Metrication Specialist
- United States Metric Association
ASM - Accredited Speaking Member
- National Speakers Association of Australia
Member, International Federation for Professional Speakers
--
