In the early 1850s, M. Sault & Co. made lathes. Their ads imply metal-working lathes, but an example of a wood lathe has surfaced. We lack any information of this maker from about 1852 through to 1864. In July 1864 the maker was M. & T. Sault. Thomas Sault received several patents related to steam engines and related products. Their ads from 1864 and 1865 mention lathes along with steam engines, shafting, etc., but later ads no longer mention lathes. The latest data point we have on this maker is from 1871, by which time the business name was M. & T. Sault Co. 1871 was a time of financial depression; it is possible that the Sault brothers lost the business in the turmoil.

By the early 1870s the business had become Yale Iron Works, a name that the Sault brothers may have used as well. In 1874 the business failed and the assets were offered for sale. Apparently someone resurrected the business in toto, for we have an 1878 ad for steam engines from Yale Iron Works.

Information Sources

• American Steam Engine Builders: 1800-1900 by Kenneth L. Cope, 2006 page 214
• Thanks to Jim Yonkers for bringing this maker to our attention via an owwm.org forum discussion.
• Results of the Twenty-Fourth Annual Fair of the American Institute, October 1851: "M. Sault & Co., New-Haven, Conn., for an engine lathe, with an improved method of attaching the slide rest to the shears. Silver medal."
• The 129th Assembly of the State of New York reported on the October 1851 Fair of the American Institute:

  From M. Sault & Co., New Haven, Conn. An engine lathe with an improved method of attaching the slide rest to the shearss whereby the whole height from the centre to the shears, can be used for the work to be turned. It is an ingenious arrangement, and merits attention.

  Sault's lathe was awarded a Silver Medal.
• Transactions of the Connecticut State Agricultural Society for the Year 1856 lists the results of the state fair in New Haven, held October 7-10 1856. M. Sault of New Haven won a Diploma for his bench lathe.
• Ad in the 1864-07-09 issue of Scientific American: "Manufacturers of steam engines. with the link motion, variable cut off of the most approved construction; also Lathes, Mill-gearing, Shafting, Hangers and Machinery in general. Address M. & T. SAULT, New Haven, Conn."
• Ad in the 1866-07-07 issue of Scientific American: "Steam engines with link motion, variable automatic cut-off, of the most approved construction; mill gearing, shafting, hanger, etc. Address M. & T. SAULT, New Haven, Conn."
• Ad in the 1871-03-18 Scientific American: "Heavy Castings for forge and mill work. The M. & T. Sault Co. Steam engine builders & founders, New Haven, Conn."
• Ad in the 1869 book, The Attractions of New Haven, Connecticut by S. H. Elliott. The ad is for "M. & T. Sault Company / Marine & Stationary Engines..." In the editorial content the book mentions "the Iron Works of the brothers Sault..."
• Municipal and Private Operation of Public Utilities, a 1907 report to the National Civic Federation's Commission on Public Ownership and Operation, describes the infrastructure of the city of New Haven, including the following tidbit about the water pumping station:

  In the old engine room there is a 6,500,000 gallon horizontal gear crank and flywheel steam pump, built in 1870 by the Yale Iron Works, successor to the M. & T. Sault Company, New Haven. There are one steam cylinder and two double acting pump cylinders. This engine * * * is of a very unique and remarkably cumbersome design. It was not run in 1905 except for three or four hours on one occasion, while a new set of valves was being put into the Worthington engine. While antiquated and inefficient, it is kept in good order and ready to run in case of emergency, being turned over by bar several times a week.

  Note that the 1870 date is inconsistent with the 1871 Scientific American mentioned above.
• The book A Guide to Historic New Haven, Connecticut, by Colin M. Caplan, 2007, lists the following building:

  419 Chapel Street, Yale Iron Works Building, 1870. This Italianate-style foundry building, one of the last remaining in the city, was built for William B. Pardee of the Yale Iron Works. In 1888, M. Armstrong & Company occupied the building.

• An ad in the 1874-05-16 through 1874-06-27 Scientific American reads as follows:

  GREAT BARGAIN. The property of the Yale Iron Works, consisting of one machine shop, 60x130 feet, basement, two floors and attic, with new engines and boiler, shafting, tools, etc., all in running order, suitable for manufacturing Engines, Tools, etc. Also, one Foundry Building 50 feet x 130 feet, with two cupolas, crane, flasks, scales, and every thing complete for doing a large iron foundry business. The buildings are brick, situated on the corners of Chapel Street, the business street of the city. The buildings will be sold separate or together with or without the machinery. Also, large assortment of engines and tools ready for delivery. All things considered, this is a chance of a lifetime for a most profitable investment. New Haven, Conn. H. B. Bigelow, Assignee.