Break Down By

This facility allows you to explore your results by counting the tagged elements that make up each trial account. Once you have generated a set of results, you can, for instance, break them down by Defendant Gender or any of nine other criteria. Because many trials involved multiple charges, defendants, victims and verdicts the resulting breakdown can appear to include trials that do not immediately conform to your original query. This facility also allows you to use keyword for your breakdown. This generates and ordered list of the 1000 most common words in your results.

Selecting the Drill option that appears by your breakdown will return trials that include all instances from within your results, with that particular characteristic.



Undrill allows you to revise your query on the fly - to, for instance, explore the impact of changing one or more search criteria, to identify how each aspect of a complex query effects the results.


Send to Voyant

Voyant Tools allows you to analyse text by word frequency, to identify unique and distinctive words, chart vocabulary density, generate word clouds and other forms of visualisations, and explore trial texts as a linguistic corpus. This demonstrator is currently configured to send either the first 10, 50 or 100 trials form your results to Voyant Tools. Selecting this option should automatically open a new browser window, and begin the process of exporting the trial text.



This function allows you to download the full text of your results. It is currently configured to return only the first 10 trials, to ensure that server capacity is not affected.


Query URL

Selecting Query URL will generate a new tab which incorporates all aspects of your query in the address line. A search, for instance, on female defendants found guilty of murdering a male victim would look this this:

This URL will return the first 10 trials that meet your criteria. You can return a larger number of trial IDs by modifying the count=10 element of the Query URL. The system defaults allow you to change this to any number up to 1000.


More Like This

The More Like This function allows you to identify similar texts to the trial you start with. It relies on measures of word frequency and density, and works best to locate trials with similar descriptive elements. As aspects of criminal justice – the precise nature of the crime, verdict and punishment - are frequently described using similar words, More Like This will also tend to locate trials for the same kind of crime or which resulted in the same punishment.

For a more detailed account of how More Like This works see Using the OB API Demonstrator.


Old Bailey API Demonstrator

This query page allows you to locate and export the individual trials that make up the Proceedings. It is not configured to search the other types of text such as front matter and advertisements. This Demonstrator has been created to facilitate the dynamic exploration of trial results, and the export of trial texts and collections of trial URLs both to the bibliographical management system, Zotero, and to the suite of tools for linguistic analysis available through Voyant Tools. It also includes a More Like This function that allows you to build new searches based on a Text Frequency - Inverse Document Frequency (TF-IDF) methodolology. To use the API directly please refer to the Documentation for Developers. For detailed help on the categories of tagged information associated with each trial, please refer to the main help section on the Guide to Searching.