CACrown ArchivesThe cinema collection
Menu
Research dossier · General Reference

Leonard Baldy

police officer (1927-1960)

Cross-disciplinary reference desk with index cards, atlas, dictionary and catalogue
General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionFeb 24, 2025
Entity authorityQ6525103 ↗
Source-derived summary

Leonard Frank Baldy (February 15, 1927 – May 2, 1960) was a Chicago Police Department officer who became the city's first helicopter traffic reporter. His sometimes comical look at Chicago's traffic problems made him a household name. His peers gave him the nickname "Flying Officer Leonard Baldy". He died in a fiery crash on May 2, 1960, when his helicopter threw a rotor blade and crashed in a railroad yard near Milwaukee Avenue and Hubbard Street.

A native of Chicago, he graduated from Lane Technical College Preparatory High School (also known as Lane Tech) and was a World War II veteran who served as a Signalman on USS Markab. Baldy gained early recognition in his police career for being the first patrolman in the United States to experiment with and use the, now famous, radar gun to detect the speed of vehicles (April 1954). He also wrote the first ticket in the world for speeding using a radar device. As a patrolman in the mid-'50s he appeared in a television commercial directing traffic.

He became the most visible department spokesperson when he provided lectures and taught classes to civic groups, organizations, and educational institutions on the topic of traffic safety. He provided the first helicopter traffic report over WGN radio in November 1958.

Editorial summary

The public source identifies “Leonard Baldy” as police officer (1927-1960). This brief keeps that definition visible, then builds a research path around Leonard, Baldy and police.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current lead gives the account dated anchors—1927, 1960, 1954, 1958—that can be checked directly. The linked authority record independently contributes the date 1927-02-15. Its value is orientation rather than verdict, with Leonard, Baldy and police providing the first useful test.
Editorial analysis

Why this record matters

A short description can identify a subject without explaining its stakes. For “Leonard Baldy”, the useful work is to connect “police officer (1927-1960)” to the records capable of establishing context and consequence.

Evidence profile

Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Feb 24, 2025. The linked authority identifier is Q6525103. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1927, 1960, 1954 and 1958.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Leonard Baldy”, its source revision and the description used here.
  2. Expand the search: follow Leonard Baldy primary sources, Leonard Baldy archive and Leonard research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Leonard Baldy”?
  2. Which cited source is closest to the event, object or claim?
  3. Which institution is responsible for the underlying evidence?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from “Leonard Baldy” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.