HEAVY CONCAV QUADRANT SCALE
maker: Ph.J. MAUL
front view heavy concav |
This Quadrant letter scale by Ph. J. Maul has a solid cast iron frame. On the back of the black painted frame is a hardly readable notation: 0200 / 500. I don't know the meaning. The bright enamelled chart is fixed onto the frame with three aluminum rivets. The weighing mechanism is mounted at the top in an U shaped part. This U shape is riveted onto the cast iron frame. At the height of the upper fixed pivot the frame has an transit hole. The second fixed pivot is directly fastened into the frame. The mechanism and the plate are of tin with a thin copper coloured ornamental protective coating. The lining of this frame is simple and firm. | 
rear view heavy concav |
More beautiful designed frames do exist for these types of letter scales. I don't know whether this design is patented. This letter scale has two ranges: 0 till 100 grams and 0 till 500 grams. To use the higher range one must first rotate the counterweight to the lower position on the lever. Different designed weighing plateaus exist, for instance an aluminum bowl. Also specimens with a higher second range can be found. Rare designs with another extra pendulum weight are known. With that extra weight even three weighing ranges are available.
zero position
lower range (100 grams) |
zero position
higher range (500 grams)
| 
concav mark
at enamel scale
|
Below some more detailed photos of this heavy cast iron letter scale.
range 500 grams |
chart with arrow-heads |
weighing plateau |
zero leveling screw |
switchable counterweight
also called: turn-over poise |
rotatable legs of frame |