W. H. Laidler Improved Measuring Gauge c. 1875-1893

Boxwood and Brass Rope Gauge, London, c. 1875–1893

Object Description & Function

The rope gauge is constructed from boxwood with engraved tables and two brass sliding scales, one of which incorporates a caliper arm. The gauge was designed to measure the diameter of rope and translate that measurement into standardized weights per fathom for various rope types, including hemp rope, manilla, shroud, and cable, all of which are engraved on the reverse face of the instrument.

The upper brass slide, fitted with the caliper arm, is used to physically measure rope thickness. The caliper is placed around the rope and adjusted until it contacts the surface evenly, allowing the user to read the diameter directly from the graduated scale. This measurement could then be referenced against the engraved tables to determine the corresponding weight per fathom.

The lower brass slide is a secondary reference scale intended to move independently. Its purpose is to align measured diameters with the engraved conversion tables, effectively acting as a mechanical aid for translating physical measurements into standardized data. On our example, the lower slide is currently fixed in place and has not been forced. The presence of two slides is a notable feature and reflects the “improved” nature of the design as described in period sources.

Taken together, the gauge functions as an early analog calculating tool, allowing shipbuilders, riggers, and marine suppliers to determine rope specifications quickly without consulting separate tables or manuals. Knowing the weight per fathom was essential for calculating load limits, selecting appropriate rigging, estimating total material weight, and ensuring the safe distribution of loads aboard ships or within dockside lifting systems.

William Henry Laidler: Inventor and Engineer

The gauge is marked:

“Improved Guage [sic] arranged by W. H. Laidler”

William Henry Laidler is documented as an engineer working directly within the rope-making industry, rather than as a tool manufacturer or retailer.

Laidler filed an application for a British patent on 31 August 1875, as recorded in The London Gazette. The relevant excerpt reads:

“And William Henry Laidler, of Bow Common, in the county of Middlesex, Engineer, has given the like notice in respect of the invention of ‘an improved measuring gauge.’”

This filing establishes Laidler as the originator of the “improved measuring gauge” design referenced on the instrument itself. The wording “arranged by” on the gauge is consistent with Victorian practice for crediting an inventor or designer whose system or layout was adopted into production.

Census and Residential Records

In the 1881 census, William Henry Laidler appears with the occupation listed as:

“Engineer – Rope Works”

He is recorded as living at 9 Leopold Street, Bow Common, Middlesex, with his wife Mary, daughter Ellen, and son Thomas. This entry confirms that Laidler was actively employed within a rope works, rather than operating independently as a manufacturer. 

Bow Common and the surrounding East London area were home to multiple rope-making and timber-related industrial operations during the 19th century. Rope works in this area served shipyards, dock facilities, and commercial maritime traffic along the Thames. Census and directory records confirm the presence of rope manufacturers and associated engineering trades in Bow Common during the period when Laidler was active.

Laidler’s occupation as an engineer at a rope works places him in direct contact with the practical challenges of rope measurement, specification, and standardization—providing a clear professional context for the development of his patented gauge.

1890 London Directory

A London Directory entry from 1890 lists both:

William Henry Laidler – Engineer
Thomas Laidler – Engineer

at the same Bow Common address. This supports the conclusion that Thomas Laidler, who later appears in probate records, was his son and may have followed him into the engineering profession.

Probate Record (1893)

William Henry Laidler died on 21 February 1893. Probate was granted later that year, and the notice records the following:

Address: 9 Leopold Street, St. Paul’s Road, Burdett Road, Middlesex
Occupation: Engineer (manager of rope works)
Executor: Thomas Laidler, Engineer
Estate value: £350 4s. 8d.

This probate entry confirms Laidler’s professional standing and continued association with rope works up to the end of his life.  The value of his estate (roughly £50,000–£60,000 in today’s money) reflects a solid middle-class position for a skilled industrial engineer, consistent with someone who held a senior role—such as managing a ropeworks—but not consistent with a major industrialist or manufacturer. It suggests Laidler enjoyed a degree of professional stability and financial security unusual for many tradesmen of the time.

R. May, London

The gauge is additionally marked:

“Mr. R. May – London”

Extensive searches of London trade directories, ironmonger listings, chandlery records, and maritime supplier references from the second half of the 19th century have not produced a definitive identification for this individual or firm as a maker. The absence of R. May from surviving directories strongly suggests that this marking refers to a small-scale retailer or distributor, rather than a manufacturer.

This aligns with common Victorian practice, in which tools often carried both the name of the designer or inventor and the name of the retail outlet through which the item was sold. In this case, R. May likely acted as the point of sale for Laidler’s improved gauge, possibly operating as a minor ironmonger or chandlery whose records have not survived.

It is worth noting that later directory listings for an unrelated R. May & Son associated with timber and slate merchants at Acorn Wharf on Old Kent Road are not consistent in trade, location, or period with this instrument and are considered unrelated.

Dating & Historical Context

Given the available evidence, the gauge can be dated with reasonable confidence to the period between 1875 and 1893, bounded by:

1875: Filing of Laidler’s patent for an improved measuring gauge
1893: Laidler’s death

The wording on the gauge, the dual-slide design, and the direct attribution to Laidler strongly indicate manufacture during his lifetime rather than posthumous production.

Summary

The rope gauge represents a documented example of a late-19th-century industrial measuring instrument designed by a working rope works engineer and patented in 1875. Its engraved tables, dual-slide configuration, and caliper mechanism reflect a practical solution to the real demands of maritime and dockside labor. The instrument stands as a tangible link to Victorian-era rope manufacture, rigging practice, and the everyday engineering tools that supported Britain’s maritime infrastructure during the final decades of the 19th century.

The W.H. Laidller rope gauge sold in December 2025.  The original product listing has been retained in the shop archive.