Unmarked but identified by Tom Wyman + layout on back merely extends range from front - possibly out of a Sikes Hydrometer set or modern replica

More likely retailer than maker + layout on back merely extends range from front 

Front face for Gauging & Ullaging calculations & reverse side for Reducing & Stocktaking calculations + other known examples always part of spile rod set

Scale runs form 0 -10 + full set of 9 brass weights (10 - 90) all stamped: 42300

Post 1824 imperial based units/gauge marks + front face bottom slide can be slotted in alongside top slide (hence it only runs to 9.5) for double length i.e. Everard-like + considered by fellow collector David Riches Missing Link between square Everard design & follow-on duplex models - read more ...

​Scales run from 55 to 70 (1055/1070)

Seg Ly. scale on front face is for gauging when the cask is lying on its side + SPH’D scale on back face is for calculating the spheroid

Makers No. 248 + pre 1825 because of Winchester based units/gauge marks + back of slide Face “A” = Divisors for various liquids + back of slide Face “B” = scales for correcting calculations for spheroid casks & other models + back of slide Face “C” = more Divisors + back of slide Face “D” = gauge points for various liquids

Post 1824 because of IM B & IM G gauge marks signify change from Winchester to Imperial based measurement - bottom Seg Ly. scale is for gauging when the cask is lying on its side

No. 1075 with early Liverpool address for helping publicans/innkeepers calculate over/under proof alcohol, gauging, blending, stocktaking, discount and profit + altimeter top-edge cm scale for height of liquid in a standing bottle + special C scale when used with either D, E, or F = amount of liquid in a barrel + G & H scales & reducing scale = amount of water to add to reduce alcohol strength (proof) or amount of spirits to add to raise alcohol strength + I & J scales give value of spirits if alcohol strength is raised or lowered + I & K scales = profits or discounts on sales/cost

Trade rule calculating over/under proof alcohol, gauging, blending, stocktaking, discount & profit + later Gloucester Terrace address = possibly made by Lucas

Layout on back of Proof rule merely extends range from front + 2nd Comparative rule is for calculating temperature corrections + hydrometer scale runs from 0-10 range + partial set of 8 brass weights (10 - 90 but 30 missing + cap) all stamped: 6755 but 2 from Dring & Fage + thermometer by Dring & Fage

Post 1824 imperial based units/gauge marks + front face bottom slide can be slotted in alongside top slide (hence it only runs to 9.5) for double length i.e. Everard-like + considered by fellow collector David Riches Missing Link between square Everard design & follow-on duplex models - read more ...

​6 round spile rods screw together to make 5 foot dipping rod with inch & imperial gallon scales + front face for Gauging & Ullaging calculations & reverse side for Reducing & Stocktaking calculations

Layout on back of Proof rule merely extends range from front + hydrometer scale runs from 0-10 range + full set of 9 brass weights (10 - 90) all stamped: 6187 + thermometer by J. Casartelli & Son

For calculating legally allowable units of alcohol/type of drink for given body mass ​

Layout on back merely extends range from front

Layout on back merely extends range from front + narrow as a pocket model but longer

Layout on back merely extends range from front

Scales runs from 0 to 30 + 5 weights calibrated in steps of 30 from 1000 to 1120 but missing thermometer

Layout on back merely extends range from front

Post 1824 because of Imperial based units/gauge marks + back of slide Face “A” = Divisors for various liquids + back of slide Face “B” = scales for correcting calculations for spheroid casks & other models + back of slide Face “C” = more Divisors + back of slide Face “D” = blank