30 
[0 
30 
20 
WN 
“0 Tone 
} 
» 
3 
Severity Rats» 
1.000 Tas 
1920 1921 1022 1923 1924 1925 
12.0 35.3 30.6 32.6 27.1 18.5 
Number of Accidents per 1,000,000 Tons 
1.563 5.60 5.36 4.65 4.76 "3.70 
Days Lost per 1.000 Tons 
CHART 41 AccmENT FREQUENCY AND SEVERITY RATES IN TERMS OF PRODUCTION 
FroM 1920 10 1026 oF 120 COMPANIES MANUFACTURING PORTLAND CEMENT. NuUM- 
BER OF EMPLOYEES ABOUT 35,000 
Frequency rate decrease ......... 
Severitv-rate decrease .... 
..eese. 40 per cent 
47 &@ 
0 
Frequency Rate per 
10.000 Tons 
Is 
Ss Ton 
1921 
14,9 
s mm 
922 1923 ] 
1.2 10.2 8.90 
Accidents per 10,000 Tons 
4.88 6.25 2.08 
Davs Lost per 100 Tons 
2 
1925 
5.75 
2 40 
CHART 42 AcciENT FREQUENCY AND SEVERITY RATES IN TERMS OF PRODUCTION 
From 1921 10 1926 oF 3 CoMpPANIES MANUFACTURING Acips AND HEAVY CHEMI 
TALS. NuMBER oF EMPLOYEES, 4,276 
Accident frequency rate decrease ....................57.5 per cent 
Accident severity rate decrease. ...60.2 68