Image
Category
Maker
On Display
Object type
Place
Material
Date

Balance scales, Roberval's system

Letter and parcel balance, Willis patent

Brass letter balance, Roberval type, 1871-1897

1871-1897

19th century Indian Postal Balance

Bilateral pendulum-type letter balance, German

1900-1914

Pendulum-type letter balance, German

1900-1914

Quadrant pendulum-type letter balance, German

1900-1914

Postal Scale

1890-1910

Equal-arm Roberval-type letter balance

1900-1914

Hoopers pocket letter weight

1840-1850

Braby quadrant type

1826

Hydraulic letter balance

1840-1850

Postal scales, Bismar type

Double pendulum postal balance

Letter scale, spring balance

Spring postal balance with dial scale

1960

Columbus model letter balance, German

1900-1914

German letter balance

1900-1914

Postal scales, self-indicating type, 1900

1900-1910

Equal-arm Roberval-type letter balance

1900-1914

Parcel platform balance by De Grave London, 1850-1880

1850-1880

GPO parcel scale by De Grave, London with 6 Imperial weights.

GPO parcel scale by De Grave

1850-1880

Cardboard 'Easy Weigh' postal balance by Royal Mail to check 20, 40, 60, & 100g letters, c.2000.

Cardboard 'Easy Weigh' postal balance by Royal Mail to check 20

2000

"Oslers Patent Letter Gauge" (c.1839). A balance working on a unique principle: an ivory rod is surmounted by an ivory tray for weighing the letter; the rod floats in a tube of mercury, while an iron ring around the rod indicates the weight on a gauge. Under base is a green paper label, printed A.F.OSLER - REGISTERED NO 125 - PERSUANT TO 2 & 3 VICTORIA CAP.17 DECEMBER 12 1839. With ormolu foot

"Oslers Patent Letter Gauge" (c.1839)

1840-1850

"Osler's Patent Letter Gauge" (c.1839), Ivory plunger marked to weight 2 ozs to 1/4 oz; a tube of mercury fices in an ormolu socket on a square base. Green label, A.F.OSLER. REGISTERED NO.125. PURSUANT TO 2 & 5 VICTORIA CHAP. 17. DECEMBER 12, 1839

"Osler's Patent Letter Gauge" (c.1839)

1840-1850

Brass self-indicating Letter Balance with case, 1863, (Hall's patent, made by Parnell, London). Indicating from 0 to 4oz. with corresponding letter charges up to 8d (2d per 1oz.). Sensitivity 30.0gr.

Hall's postal balance made by Parnell, London, 1863-1875

1863-1875