Categories

A
Algebraic Curves and Surfaces
B
Combinatorical Geometry
C
Topology
D
Kinematics and Mechanics
E
Differential Geometry
F
Algebra
G
Analysis, Probability Theory
H
Theory of Functions of Complex Variables
J
Differential Equations, Wave Theory
K
Geometrical Optics
L
Instruments and Devices.
I
Calculating machines
II
Other calculating devices
III
Planimeters, integraphs, harmonic analysis
IV
Drawing devices
V
Nomography
VI
Photogrammetry
XX
Others
M
History of Mathematis and Astronomy
Z
Other

A Planimeter measures the size of an area for example on maps. An Integraph determines the integral of a function. With the help of a Harmonic Analyser one can compute the Fourier coefficients of a periodic function.

Models of rubric: Planimeters, integraphs, harmonic analysis