Page 67 - Loss of the VOC Retourschip Batavia, Western Australia, 1629

BatavitJ laDy-stick Mean:
1·24 Minimum:
1·227
Std. Dev.: 14.797E-3 Maximum:
1·252
Std. Error: 16.997E-4
Range: 1·024
Variance:
12.3010E-5 Sum: 111.258
Coel. Var.: 12.003
Sum Squared: 12.698
Count: 147
# Missing: 10
Count: 179
The Batavia taDy-stick has a mean density of 0.24 ± (4.8 x lO·')pont/duim'.
Wltsen lable No. 1
Mean: Std. Dey.:
1·239 16.5s0E-4 Minimum: Maximum:
beingextremelyclosetolhevalueoftheBatavia taDy-stick. Witsen lable No. 2
.237 .242
Std. Error: 17.3698E-S
Variance: 14.2908E-7
Coel. Var.: 1·274
18.877
Witsen's table No. 1covers a large number ofdiameters and giyes adensity of 0.24 ± (6.6x1O"')pantlduim', this figure
Std. Dey.:
1·013
Maximum:
Mean: 1·243
weighing systems. The density is 0.243 ±0.013 pont/duim'·
Minimum: .199
Van IJk laDy-stick illustration
Mean: 1.279 Minimum:
Std. Dey.: Is .017E-3 Maximum :
Std. Error: 11.814E-3
Variance: 13.6203E-5
Coer. Var.: 12.154
Sum S uared:
Count:
11 1
.267 .287
# Missin 3.072 .858 0
Std. Error: 12.384E-3
Variance: 11.7050E-4
Coel. Var.: Count: 15.371 130
Sum S uared: # Missin
7.293
The Witsen table No. 2 is more varied Iban No. I, especially at Ibe smaller weights, reflecting Ibe inaccuracies of Ibe
.267
1.778 0
It is interesting to note Ibat van IJk's density is notably larger, and may reflectlbatlbe type ofpont or duim might be different, or Ibat Ibe illustration is fanciful. It may be concluded that theBatavia tally-stick was manufactured using a system almost identical to Ibat given in Witsen (1671):501. It was hoped that a comparison between Ibe lead and iron shot weights would give a more accurale assessment of the units used, however, the ratios between Ibe two scales are not constant and therefore there are other factors to be considered.
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