letter scale

maker: unknown, Germany
bruine lijn
letter scale, maker unknown
this letter scale goes up to 250 grams
 

This letter scale with the gracefully curved frame comes from Germany. There is no logo or brand on it. The weighing range is 250 grams. The unit of measure is stated as G.RM on the scale. The scale is subdivided per 5 grams up to 100 grams. From 100 to 250 grams, the subdivision is per 10 grams. At the ends of the scale you can just see that the scale was originally nickel-plated. The auxiliary pivot point of the scale mechanism is remarkably low on the frame. This can only be seen with the earliest letter scales from Guérin and Kern, see the images at the bottom right of this web page. This letter scale has no separate counterweight, the scale arm with the viewing window itself is sufficiently heavy. The reading thread was strangely enough on the front of the viewing window, presumably after a careless repair. I have put the reading wire on the back of the viewing window so that it is close to the chart. A letter tray was missing at the time of purchase, I just fitted a replacement brass tray on this long, slender stand.
 

back of the letter scale
back of the letter scale
 

The scale is 232 millimeters high. The replacement letter tray is 90 millimeters round. The foot width is 93 millimeters, the horizontal length of the scale frame is 186 millimeters. Below some more pictures of this beautifully curved old letter scale

scale detail
up to 250 grams subdivided per 10 grams
 
 
scale detail
the auxiliary pivot point is remarkably low
 
 
scale detail
the unit of measure GRM
 
 
detail 1
the reading window
 
detail 2
the soldered repaired reading wire
 
detail 3
with a long stripe of measure per 50g
 
detail 4
the reading wire was in front of the window
 
detail 5
the bought still incomplete scale
 
Guerin scale
Guérin's letter scale with a low auxiliary pivot point
source: Le Génie Industriel, February 1853, pp94-95
 
Kern 1874
Kern letter scale from 1874 with low auxiliary
pivot point, the first copies were sold in 1851
 
bruine lijn
« collection part 22 «© copyright André Solversion: January 20, 2021