---
title: "Eighteenth-century London instrument workshops drew their brass partly from a trade in stolen metal"
type: "claim"
status: "seedling"
source_url: "http://journal.sciencemuseum.ac.uk/article/the-18th-century-instrument-trade/"
source_title: "Reading, writing, drawing and making in the 18th-century instrument trade – Science Museum Group Journal"
source_author: "Florence Grant, Science Museum Group Journal, 'Reading, writing, drawing and making in the 18th-century instrument trade'"
source_date: "2014 (Spring, Issue 01)"
source_quote: "tradesmen settl[ed] their foundry bills in part through credit for old metal, while a brisk trade in stolen brass, often along the same routes, was fed by theft from workshops and storerooms"
source_tier: 2
audit_status: "flagged (single Tier-2 peer-reviewed source; the verbatim quote was captured by the batch worker but not independently re-fetched or archived this promotion) | 2026-07-12 cross-model audit (claude-fable-5): source re-fetched directly; quote verified verbatim; districts, George Adams, and peer-review status confirmed; source_date corrected 2026-07-09 (capture date) -> 2014 (Spring, Issue 01) and source_author corrected to name Florence Grant; flag on the un-re-fetched quote resolved"
writer_model: "claude-opus-4-8"
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-pious-perjury-bloody-code.md, 2026-07-11"
origin: "hop-batch"
derived_from: ["10-inbox/raw/2026-07-09-hop-pious-perjury-bloody-code.md"]
date_created: "2026-07-11T00:00:00.000Z"
tags: ["economic-history","georgian-england","instrument-trade","metal-theft","supply-chain"]
audits: ["2026-07-12 claude-fable-5"]
---


In eighteenth-century London, scientific-instrument makers such as George Adams sourced brass from foundries clustered in specific districts — Aldersgate, Moorfields, and Bishopsgate, and around Snow Hill and Shoe Lane. According to a peer-reviewed Science Museum Group Journal study of the trade's economics, this legitimate supply network ran alongside an illicit one on the same physical routes: "tradesmen settl[ed] their foundry bills in part through credit for old metal, while a brisk trade in stolen brass, often along the same routes, was fed by theft from workshops and storerooms." Theft of raw and worked metal from the makers' own premises was routine enough to count as a named feature of the supply chain rather than an occasional loss.

The point of interest is the entanglement: a prestige craft producing precision optical and mathematical instruments partly depended on, and partly leaked into, a criminal market in second-hand metal. The recycling of "old metal" for credit and the fencing of stolen brass were adjacent activities, hard to separate at the point of purchase.

This is a mundane-infrastructure counterpart to other cases where the precision-instrument trade could not fence its own knowledge or materials — compare [[claim-lippershey-1608-telescope-patent-denied-as-too-easy-to-copy]], where a telescope's construction was too simple to protect. Here the leak is physical rather than informational: the metal itself circulated out of the workshop and back through the market.

The claim also sets up a legal bridge. Because a stolen brass instrument or component had real resale value, such a theft sat squarely inside the property-crime statutes of the period — see [[claim-englands-bloody-code-made-petty-property-theft-a-capital-crime]] — which in turn provoked the jury workaround described in [[claim-georgian-juries-undervalued-stolen-goods-to-avoid-the-death-penalty]].

> [!note] Seek's commentary:
> This is the cleanest-sourced claim in the capture — one Tier-2 peer-reviewed venue with a verbatim quote — and the only one I did not have to flag for weak sourcing. It earns its place mostly as the load-bearing first step of the hop: a refined trade quietly running on a black market in metal is exactly the kind of tension that makes the downstream legal history land.
> — Seek