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The purpose of a hydrometer is to determine the specific gravity of a liquid. From this it is often possible to determine the composition or strength of the liquid. The Sikes hydrometer was, for very many years, the standard means of determining the alcohol content of spirits and hence the duty payable. I have added gauging rules as they were also associated with determining the duty payable on wines and spirits.
Two ounce class B beam scale by C Stevens & Son, Scale Makers, 58 Boswell Road, London EC1. It has “H M Govt” on the raising lever. It can be dismantled and placed in the box drawer. It has a selection of apothecary’s weights and there are two glass and one brass pans. The weights are mostly stamped with a crown over “GR” and the year below (mostly 36 to 38) indicating that the balance dates from the 1930s.
A GPO letter scale made by De Grave & Co, London and refurbished (twice) by the Wiltshire Scales Co. Metric with 100g, 50g, 20g and two 10g weights (there should be one 10g and two 20g). Last refurbished in 1999 it was then intended for weighing airmail letters. The scales may originally have been for imperial measurements and had imperial weights. The weights present all have different dates and two are stamped Turier (maker?)
A set of metric weights dating from the mid 20th century and supplied by the firm whose transfer is on the lid. The brass weights run from 1g to 100g and the others from 10mg to 500mg.
Cheap folding scale, probably for an apothecary. The beam is about 6 inches long and steel with swan-neck ends. The column, pans and other metal parts are brass. The base and drawer are crudely made from oak (visible parts) and pine (drawer sides, back and bottom, and box bottom). Ca.1900.
A set of apothecary weights by P Rogers & Co. There are three two drachm/dram weights, a one dram weight, three half dram weights, a two scruple weight, and two one scruple weights. Note that drachm is mis-spelt dram on all but the first example of the drachm weights. The obverse of each has the weight in word and symbol format and the reverse has Standard P Rogers & Co on it.
A set of six spile rods and a proof slide rule in a fitted leather case. The rods and slide rule are signed ‘Buss maker 33 Hatton Garden London’. The spile rods screw together to form a five foot dipping rod with inch and imperial gallon scales, that could be inserted through the spile hole in a bung. Thomas Odempsey Buss and his successors were  at 33 Hatton Garden from 1865-1911.
Self erecting coin scale by Stephen Houghton & Son, Makers, Ormskirk, Successors to A Wilkinson The left end of the beam has a turn over weight that is divided into two sections longitudinally. The right end has a sliding poise. The various combinations of positioning these allow the weights of guineas, half guineas and third guineas (seven shillings), sovereigns and half sovereigns to be checked. Ca. 1820. The paper in the left part of the box gives the instructions and that on the right part (lid) says they are accurate and gives the weights of each of these coins.
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Assay or jeweller’s balance by Samuel Read dating from 1735-1748. Trade label states:
“All sorts of scales & weights for foreign Plantations according to his MAJESTIES ‘Proclamation. Also Scales & Weights for Essays, Diamond Scales, Scales for Gold & Silver, Weights of ye right Standard and Stilliards of all sorts by Samuel Read Scale Maker, at the Angel & Kings Arms, St Anns Lane near ALDERSGATE LONDON” The weights are for 2, 3, 8, 16 and 64 carats. Three weights are missing, presumably 1, 4 & 32 carats. The original tweezers for the weights are housed through a slot in the right hand side. (NB. The beam is upside down in the right hand photo. The function of the rectangular piece of brass is not known)
A set of brass weights from 1 to 500 grammes (sic) dating from the first half of the twentieth century. They are all stamped with a crown over the letter T except the 20 g weight that appears to be a replacement. They also have another stamp that appears to be a head facing left with the number “09” underneath. On the largest two weights this is stamped into a copper plug in the base of the handle. They were used by a chemist.
3 ft 4 fold dipping rod signed J Long Maker Eastcheap London. It is graduated for 5 sizes of cask, both lying and standing. These are the hogshead (54 gallons), barrel (36 gallons), kilderkin (18 gallons), firkin (9 gallons), and pin (4 1/2 gallons).

Self erecting guinea scale signed H Bell, Prescot, Lancashire. This scale is for weighing guineas and half guineas only and has only a single turnover weight. The sliding poise was used for determining how under-weight a coin was (and hence its monetary value) if it had been clipped or was very worn. Probably ca.1800. Hamlet Bell was working from 1781 to 1820 when he died.

A fine set of metric chemistry weights in a mahogany box, engraved “No 244 Owen’s College 1895”. The brass weights run from one to 50 grams, the aluminium ones from 1mg to 500mg. The tweezers are ivory tipped to avoid damaging the highly accurate weights. The purpose of the two wire items is not known. There is also a chamois leather outer case.