ustry.

The great work of "Dilution" in Munitions--and by dilution we mean
the use in industry of unskilled, semi-skilled and woman labor, so
that highly skilled men may not be used except for the most important
work--is done by the Dilution Department of the Ministry of Munitions,
which issues Dilution of Labour Bulletins and Process Sheets
periodically, showing the work women are doing. A series of
exhibitions of women's work have also been arranged by the Technical
Section of the Labour Supply Department in all the big towns
in England. In Sheffield over 16,000 people came to see the
Exhibition--the largest number of these being foremen and workmen sent
by their firms.

[Illustration: RIVETTING ON BOILERS]

[Illustration: FACING BOILER BLUE FLANGES]

The Exhibitions consist of two main sections, one of which shows
actual samples of munitions made by women, and the other of
photographs of women doing work on apparatus or processes that could
not be shown. A complete Clerget engine, for instance, was lent by the
Air Board to illustrate the final assembly of the numerous parts of
these engines being made wholly or partly by women. In the same way,
many parts of complete Stokes Guns, Vickers Machine Guns and Service
Rifles were exhibited. The exhibits were divided into fifteen groups.
The first group dealing with engines for aircraft. The second group
showed engines for motor cars, tanks, tractors, motor buses, motor
lorries and motor vehicles.

A separate group consisted of a variety of accessories for internal
combustion engines, including air pump for the Clerget engine, which
is completely manufactured and assembled by women, largely under women
supervision; and magnetos, a very important and accurate industry,
before the war largely in German hands, of which women now undertake
the entire manufacture.

The fourth group dealt with steam engines, including details of
locomotives, high speed engines, steam winches, and steam turbines.

The next two groups dealt respectively with guns and components and
with small arms.

The next three groups included gauges, drills, cutters, punches and
dies, trucks, jigs, tap pieces and general tool-room work. The gauges
included plug, ring, cylinder and screw gauges to the closest degrees
of accuracy, which in practice are verified by the rigid inspection of
the National Physical Laboratory.

A fair illustration of the accuracy that is habitually required in a
large volu