Length measuring apparatus

Details Length measuring apparatus Length measuring apparatus

1989-10-23

1991-10-29

Lall, Parshotam S.

Boots, shoes, and leggings

33773, G01B 1102, G06F 700

Patent

active

050620630

ABSTRACT:
A length measuring apparatus which is capable of calculating an actual distance by measuring length on a map and which has a display section to display the actual distance thus calculated. The length measuring apparatus includes a distance-data input switch for inputting a distance-index data of a scale-reduction scale indicated on the map and a memory for storing length of the scale-reduction scale on the map, which is measured by the rotation of a rolling member. The length measuring apparatus automatically calculated a scale-reduction value for the map from the distance-index data and the length of the scale-reduction scale stored in the memory. Accordingly, a user of the apparatus is not required to input the scale-reduction value for the map by means of keys.

REFERENCES:
patent: 3999298 (1976-12-01), Nishimura
patent: 4009339 (1977-02-01), Anderson et al.
patent: 4383301 (1983-05-01), Morita et al.
patent: 4914831 (1990-04-01), Kanezashi et al.

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