Definition
LOCATOR carries two distinct legal meanings depending on context.
1. Civil law sense: The party who lets or leases a thing to another for hire or compensation. The locator is the owner-lessor in a contract of hiring (locatio conductio), standing in correlative relation to the conductor, who is the hirer or tenant. Bouvier identifies four core duties of the locator: delivering the hired thing to the hirer for use; guaranteeing the hirer's free enjoyment of it; maintaining the thing in good order throughout the hire; and warranting that the thing is free from defects that would destroy its use. This sense derives from Roman law and passed through Scots law into common law commentary.
2. American land law sense: One who locates land — that is, one who selects, marks, and claims a parcel of public land under applicable law, or who is entitled to do so. The term appears prominently in mining law, where a locator is the person who stakes a mining claim on public lands under the federal mining statutes.
Common Language
Modern common usage (Wiktionary): One who, or that which, locates. Also, in travel industry usage, a unique alphanumeric reference assigned to a booking.
Historical common usage (Webster's 1913): One who locates, or is entitled to locate, land or a mining claim.
The gap is meaningful. Ordinary modern usage treats "locator" as a generic agent noun — a person or device that finds things. The legal term carries two specific, technical meanings with no connection to the act of finding: the civil law locator leases property; the land law locator claims it. Neither use involves discovering something in the ordinary sense.
Common Confusion
The civil law locator (lessor) and the American land law locator (claimant) share nothing but the word. Researchers working in Roman law, Scots law, or civilian-tradition jurisdictions will encounter the term in its leasing sense. Researchers working in American public land or mining law will encounter it exclusively in the claims sense. Conflating the two produces fundamental misreadings. Additionally, locator and conductor are easy to invert: in the civil law pair, the locator lets and the conductor hires — the opposite of what intuition might suggest from the English word "conductor."
Why It Matters in Research
The dual meaning is a genuine research trap. A source discussing locator duties in a treatise on bailment or hire is almost certainly using the civil law sense; the same word in an 1880s federal mining case or a public land patent proceeding means something entirely different.
For civil law research: Burrill's detailed Latin references and the Pothier citation in Bouvier point toward the deeper Roman law foundation. Researchers tracing the duties of a lessor in civilian or mixed jurisdictions (Louisiana, Quebec, South Africa, Scotland) should follow those threads rather than common law landlord-tenant doctrine, which developed on different principles.
For American land law research: The locator concept is central to the federal mining claim system and the general land disposition framework that operated through the General Land Office. The locator's acts — survey, marking, filing — determined the validity of the claim. Corpus research should treat locator as a term of art requiring attention to the specific statute or administrative regime in play, since requirements varied by era and mineral type.
Historical corpus warning: Nineteenth-century American legal texts sometimes slip between the two senses without signaling the shift, particularly in works that blend civilian commentary with American practice. Check context carefully before assuming which meaning applies.
Historical Dictionary Support
All four source dictionaries recognize both meanings, which reflects how consistently the dual usage was understood by the late nineteenth century. Black's (both editions) presents the civil law sense first, then pivots to the American land law sense with a cross-reference to LOCATION — suggesting the editors regarded the land law meaning as the more practically significant one for American practitioners. Burrill is the most scholarly, providing Latin form, French equivalents, and Roman law citations (the Institutes, Digest, and Code), making it the most useful entry for tracing civil law lineage. Bouvier is the most practically oriented on the civil law side, enumerating the locator's four duties in a form that mirrors civilian contract analysis.
None of the historical dictionaries address the mining law context with any depth; they treat land location generically. Researchers needing detail on mining claim locators will find the dictionaries a starting point only — the substantive law lived in the federal statutes and the case law interpreting them.
Jurisdictional Note
The civil law sense of locator is operative in mixed and civilian jurisdictions (Louisiana, Scotland, Quebec) and in any common law jurisdiction whose courts drew on Roman or continental sources for bailment and hire doctrine. The American land law sense is a creature of federal public land and mining law and has no direct civilian counterpart.