Hyperbolic Match Output

Number:28

Maker:FABER-CASTELL (Germany)

Model:Mathema No. 2/84N

PHOTO

Scales Front: Left Front: (eXg),tan xg,sqrt(X2-1),sqrt X, || sqrt X, (1 / sqrt X), 1/y, y || Y, sqrt( 1 - X2), sin Xg, (eX) ||
Right Front: || gln Y, gtanY, sqrt(1 + Y2), Y2 || y2, 1/y2, 1/y, y || Y, sqrt(1 - Y2), gsinY, (lnY) ||

Scales Back: Left Back: || 10 ln X, ln X, 0.1 ln X, Y || y, 0.1 cosh xg, 0.1 sinh xg, sinh xg || tanh xg, -0.1 ln X, -ln X, -10 ln X ||
Right Back:|| e0.1Y, eY, e10Y , Y || y, gcosh 10y, gsinh 10y, gsinh y || gtanh y, e-10Y , e-Y, e-0,1Y ||

Gauge Marks:

Cursor Front: Under the upper two sqrt X scales are two lines to the left at 2π and π/4. To the right are two lines at 4π and π/2. These symbols were printed above on the cursor.

Cursor Back: Under both the the upper and lower scales are two lines at left at 2π and π/4. To the right are two marks at 4π and π/2. These symbols were printed above and below on cursor.

Construction: 20 cm.; Plastic, Cursor is not framed. Adjustable metal brackets.

Date:

Source: Rod Lovett Collection

Information: This is based on 400g system. Where, 400g = 2&pi. Then, 100= π/2, and 1g= π/200. 1 Rad = 200g/π = 63.66198g. π = usual value = 3.1415927 