US$ 155.00
The material they got on why the Needle was discovered was put in a 30 minute radio show
England in 1842
with people gathered around a barred window
The River Lea and Stratford Bridge with a covered cart crossing
On each side are images of the Trajan and Naval Columns
Robert Bate's hydrometer Pevensey The material they got onA hydrometer with hinged wooden case manufactured by Robert Bate. Hydrometers are used to measure the density of liquids. The weighted end is placed into a liquid and the hydrometer sinks to a certain level. The specific gravity can then be read from the liquid level on the vertical scale. ca. 1836
US$ 155.00
US$ 45.00
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US$ 650.00
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US$ 2250.00
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