New standards, dimensional and operat-

ing data, tolerances, recommendations, ap-

plications and new tables appear in 13

subject areas. For example, the Cutting

Speeds and Feeds section is completely re-

vised and expanded in 20 subjects, and in-

cludes over 30 new tables for the machining

of metals and alloys. Likewise, complete

revision and expansion occur in sections on

spur gears, tool steels and grinding, while

new standards and data are added to 9 other

sec tions.

The 19th Edition of this standard refer-

ence work for the mechanical industries

recognizes the world-wide move towards the

use of the metric System International. As

the world goes in this area, so will the Hznd-

book. Th~ 19th Edition includes consider-

able metric data based on SI units, as well

as British Standards based mainly on ISO

Recommendations. Much of the Hand-

book s information is of course independent

of measurement units, or can be used with

metric or English units.

An invaluable aid and working tool wher-

ever anything mechanical is designed or

constructed, this world-renowned book

makes available in clear, concise, ready-to-

use form the new and hard-to-get as well

as the established standard data and in-

formation needed by machine designers,

mechanical engineers, tool designers, shop

management, skilled mechanics, engineer-