6.9 Vector Hyperbolic Rules

The members of this special exhibit contain scales of hyperbolic trigonometric functions that are used in conjunction with regular trigonometric scales to perform calculations of vector quantities, and were particularly useful in electrical engineering. The first vector slide rule was the K&E Model 4093-3 (and 4093-5), which first appeared in K&E’s 1930 catalog. This model was discontinued and their new vector rule model, the 4083-3 (and 4083-5), was introduced in 1937. Other vector rules from other manufacturers quickly followed K&E’s lead during the subsequent decades.

Details of the use of these scales are provided in the vignette Vector/Hyperbolic Calculations. The Collection presently has 21 slide rules that can be classified as vector rules.

Note that the Sun-Hemmi Model 153 is included here as it had special scales from which hyperbolic function values could be determined directly. This very special rule and its scales are described in a separate vignette, Hemmi 153 Scales.

Maker	Model	Year
K&E	4093-3	1930
Hemmi	153	1931-1934
K&E	4093-3	1933
Hemmi	153	1936-1940
Hemmi	153	1938
UIF Shanghai	4083-3	1939-1947
Dietzgen	1735	1941-1952
Pickett	4	1947-49
K&E	4083-3	1948
Aristo	971	1950
Pickett	4	1950
Hemmi	255	1952
Hemmi	153	1955
Pickett	4-ES	1958
Pickett	N4-ES	1959
Pickett	N4-T	1959-1962
Relay-Ricoh	F-686	1961
Pickett	N4-ES	1964-1975
Ruyi	1002	1966
Dietzgen	N1725	1967
Blundell Rules Limited	506 Academy Duplex	1970-1980

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