Silver and other precious metals are traditionally weighed in
Troy ounces.
One Troy ounce is equivalent to 31.1g.
The standard or avoirdupois ounce (used for weighing foodstuffs
etc.) is equivalent to 28.35g.
Above: a set of brass and mahogany scales by J. Hare,
Birmingham, £35 at Brettels, Newport, September 2011
Quick Converter: values approximate
| Troy-Metric |
Metric-Troy |
| 1oz = 31.1g |
1g = 0.032oz |
| 2oz = 62.2g |
10g = 0.321oz |
| 3oz = 93.3g |
50g = 1.6oz |
| 4oz = 124.4g |
100g = 3.21oz |
| 5oz = 155.5g |
250g = 8oz |
| 6oz = 186.6g |
500g= 16oz |
| 7oz = 217.7g |
750g = 24.07oz |
| 8oz = 248.8g |
1kg = 32.1oz |
| 9oz = 279.9g |
| 10oz = 311g |
1in =
2.54cm
1cm = 3/8in (approx)
1ft = 30.48cm
1m =
3ft 3,3/8in
Quick Converter: values approximate
| Imperial-Metric |
Metric-Imperial |
| 1in = 2.5cm |
1cm = 3/8in |
| 2in = 5cm |
2.5cm = 1in |
| 3in = 7.5cm |
30cm = 12in (1ft) |
| 4in = 10cm |
50cm = 20in |
| 5in = 12.5cm |
1m = 3ft 4in |
| 6in = 15cm |
2m = 6ft 8in |
| 7in = 17.5cm |
3m = 10ft |
| 8in = 20cm |
| 9in = 22.5cm |
| 10in = 25cm |
| 11in = 27.5cm |
| 1ft = 30cm |
| 2ft = 60cm |
| 3ft = 90cm |
| 5ft = 1.5m |
| 10ft = 3m |
For smaller objects, such as coins and medals, metric
measurement in millimetres is the norm. There are 10mm to 1cm, or
about 25mm to 1in.
One mile is equivalent to 1.6km, so a 60kmh speed limit is
(roughly) 40mph.
Above: an engine turned silver 50ft tape measure by James
Chesterman and Co, Sheffield 1919, £170 at Woolley & Wallis,
Salisbury, January 2011.
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