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Date: |
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Description: | Avery scales
Walnut and brass
41.4 x 16.7 x 12 cm
Avery scales. Model 641, polished walnut box with dial (Beranger's principle) described as Vibrating Counter Scales "For Confectioners etc". A vibrator is a beam, level or scale so constructed as to operate in stable equilibrium. When deflected from the normal or rest position the beam or lever(s) will tend to return towards the normal position. This effect may be obtained by placing the centre of gravity below the face line and/or by giving nagative face to the beam. Variations of model 641appeared in catalogues published between 1891 and 1927 but was no longer listed in the 1939 catalogue. The 1909 and 1912 catalogue pictures show the window with the two pointers in as being oval, and the corners of the top of the box being chamfered. In the 1916 catalogue the window is round as in this model, it has sharp corners to the box. These types of scale were superceded by the visible weighers around the 1920's, (a pointer moving across a chart), that were much quicker and easier to use, although in a sweet shop where the main use was to sell a 1/4lb, or 1/2lb of sweets, you put a weight on the pan and poured sweets into the other pan until it balanced, which was relatively simple; unlike a grocer's for instance, where you cut a piece of cheese, and then had to put weights on the pan until you found the correct weight. You then had to calculate the cost to the customer! (11. 1/2oz's at 1/3d per lb). With the visible weighers, you just read the weight and the price to pay from the chart - no more mental arithmetic, and much quicker.Would have been used in pharmacy for weighing out powders.School of Pharmacy.
Avery scales | Publisher: | MLA:ABDRG | Rights holder: | MLA:ABDRG | Subjects: | Pharmaceuticals | Temporal: | 1912-1930 | Source: | Robert Gordon University | Creator: | Avery Ltd | Identifier: | ABDRG10330 | Language: | en-GB |
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