Robert Bate's hydrometer Pevensey with people gathered around a

with people gathered around a barred window

Three quarter length studio portrait of Peter William Barlow seated with his right hand resting upon a table

England in 1842

bottom right The Middlesex Petition

Above is a description and to the sides are lists of Nelson's victories and rewards

Robert Bate's hydrometer Pevensey with people gathered around aA 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