Chemical Match Output

Number:29a

Maker:Shanghai Chemical
PHOTO

Length: 25 cm

Gauge Marks:

Scales Front: Special Scales K A = B Special C = D DI Special

Scales Back: S[ecial Scales = D Special = Special

Info: FanHsiu Chang Collection

Further information about the scales:

Front scales:
A1 A2, Atomic weight
M1, Small compound
Ad.(g/L), Element specific gravity (Note: solid in g/cm3, gas in g/L)
Mo, Oxide

Most gauge marks can be found in the pocketbook, some notes here.
1. SO3/H2SO4 molecular weight ration 1.225 on D
Hg/H20 13.51 on D, though the density of Hg I found is 13.546
2. Kg/cm2 psi should be 14.22 but read 14.37 on D
3. M3/hr litre/min conversion 16.67
T 273 degree
P 760mmHg

Back Scales:
H2SO4 N D, sulfuric acid normality to density conversion. (Note: Other green scales for different solutions)
m, Simple compound
M2, Large compound
L%, (Note: Linear from 1000 to 2000, I guess 1000 could mean 000 or 1000, so you could sum the atomic weight by 2 linear scales to get molecular weight)
Be, Baumé degrees (heavy), specific gravity =144.3/(144.3-Be), set Be scale then read s.g. on L% scale

On the right of lower stock
Chemical slide rule
Shanghai slide rule factory