USA Scientific Instruments

Classic early twentieth century boat compass by Dirigo of Seattle Washington. The entire gimballed compass has been meticulously polished and lacque...

Choice Nautical Mariners Compass by the American Maker Wilcox Crittenden of Middletown Connecticut. The entire compass has been stripped and polished. The box has been refinished and...

Classic early twentieth century boat compass by Dirigo of Seattle Washington. The entire gimballed compass has been meticulously polished and lacquered. This Classic marine instrumen...

Classic early twentieth century boat compass by the Marine Compass Company, Polaris brand. The entire gimballed compass has been meticulously polished and lacquered. This classic mar...

Classic early twentieth century boat compass by American Maker. The gimballed compass has been meticulously polished and lacquered. This classic marine instrument is fitted to its or...

Solid brass boat compass on gimbal by Dirigo of Seattle Washington as marked on the compass card. Weight: 2 lbs Overall Dimensions: 4"H x 6"L x ...

Antique brass handle fire gun extinguisher Underwriters Laboratories Measures: 13 tall x 3 diameter Original preowned used unrestored condition Review images provided.

Great Italian intercom, called Dufono in Italy and has been attributed to the important designer Gio Ponti. Is made in Bakelite, and plated metal. Great art deco to modern design bul...

Antique French brass Halosteric barometer. With logo HNPB. Polished brass case. Beveled glass. Hanging loop. French made. Circa 1940.

Vintage tool Vintage industrial Tool in solid macassar wood and old bronze and brass. Unsure what the purpose or function is. Label logo pr...

Gimballed brass boat or yacht compass by Star of Boston. Bezel is pierced with number 27645. Beautiful polish job on the brass. Fitted to a varnished woo...

Spectacular 1940's vintage Type BB analytical scale/balance by William Ainsworth & Sons Inc of Denver, Colorado. Scale includes: - Type BB scale/balance - (2) sample pans - (2) Packs of Carl Schleicher & Schuell Co. weighing papers - Schaar & Company 500g weight set (w/walnut case) - Copy of original user/instruction manual This scale has been painstakingly stripped and polished to reveal its wonderful industrial/machine age construction consisting of aluminum, brass, glass and solid walnut. Scale includes a copy of an original 1948 user manual to aid in calibration and use. This piece would make a wonderful display case/ functional scale for the boutique spice, tea, vitamin supplement or marijuana dispensary! Specifications: CAPACITY: 200 grams in each pan. SENSITIVITY: 1/20th mg. BEAM: 6 inches long. of hard rolled aluminum alloy. machined from the solid slab. The edges an of the angular shaped agate, swaged Into place insuring permanent accuracy. Edges: Of hard, clear, white agate, polished with optically accurate contact angles. PLANES: Of hard, den, white agate, polished optically flat. HANGERS: Are 4 1/4 inches wide at the bows, by 8 inches high, with 3 1/4 inch diameter aluminum flanged plates. Each balance is supplied with two removable nickel plated pans 3 inches in diameter. RIDER CARRIER: Two rider earners are supplied. one for each title of the barn. There arc no metal to metal sliding contacts, and the carriers may be rapidly moved without throwing the rider. Ten milligram riders with square eyes arc used. The riders are set squarely on the beam with ease. RELEASING MECHANISM: Is of a modern design and construction, incorporating swing stirrup support levers pivoted in line with the line of contact of the center edge. so that if the stirrup levers are railed while the beam is swinging, the stirrups will fall into the yokes at the ends of the levers, and the planes will not be moved across the edges. thereby impairing the sensitivity. The pan arrests are adjustable and are operated by a button in the center of the beam arrest knob. FINISH: With the exception of the stirrup support levers and column base, which are finished in crystallized black, the rat of the metal watt is rhodium plated. CASE: Is made of aluminum. The case will not warp, shrink, nor swell, and therefore maintains the perfect alignment of the operating mechanism. Dimensions are I8 inches wide 18 inches high, and 10 inches deep. The case is provided with a counterpoised front door and a removable rear door, black Carrara glass base, spirit levels. and four leveling screws. TYPE BB CHAINWEIGHT ANALYTICAL BALANCE This balance is identical. in general construction and performance, to the Type B described on the preceding page. except that it incorporates the Chainweight device and notched beam, thereby eliminating the use of all fractional weights below one gram. CHAINWEIGHT DEVICE: Operates by means of a flexible graduated metal tape instead of a movable vernier. Thus, the point at which the Chainweight readings are taken is always at eye-level. thereby eliminating the inconvenience of crouching to low positions and errors due to parallax. The operation of the chain is more rapid than in other makes; two and one-half turns of the knob at the right end of the case moves the chain throughout its entire 100 milligram range. The entire chain driving mechanism is direct-connected to insure positive drive—all friction drives have been eliminated. ADJUSTABLE VERNIER: Enables the adjustment of the equilibrium by the correct method of wing the chain. When this has been accomplished, the zero point is set by moving the vernier with the knob on the !eft end of the balance to agree with the zero point on the graduated tape. All of this is accomplished without the inoanvenknce of opening the door or moving the index out of its true alignment. CHAIN SUPPORT: On the beam is of a frictionless type, using a pivot and jeweled bearing. This eliminates any possibility of the chain swinging with the beam: thus. decreasing the sensitivity. NOTCHED BEAM: Has 11 notches numbered from zero at left to 10 at the right, representing 0 to 1 gram according to the position of the beam weight which may be shifted from one end of the beam to the other by means of the carrier ann. The combined capacity of the notched beam and chainweight feature is 1.1 grams; thus, rendering unnecessary the use of all fractional weights. Weight: Net, 32 lbs. (Packed, 60 Ibs) History on the company: Development of the manufacture of assay balances in the western states begins with the company of William Ainsworth. Ainsworth, the founder of William Ainsworth & Sons, Inc., was born January 22, 1850, in Lancashire, England. He, his mother and a sister Anne Elizabeth (born May 1842) came to America in 1853, but for reasons not known, he and his sister were soon was left orphans. Regardless of the circumstance that brought this about, William was left in the care of George and Suzanne Elliott an English family owning a farm near Sussex, Wisconsin. His sister was left with the Charles Hart family in nearby Brookfield. In order to pay for his food and lodging William performed farm chores. Ainsworth's particular passion, even as a small boy and continuing through the rest of his life, was for steam engines, although he seemed to have an affinity for all types of mechanical apparatuses. One story that he often told gives us some insight into his abilities: Arrival in his neighborhood of the first grain binder caused great excitement on the farms in the area. Unfortunately, the owners had no idea how to assemble it, so they sent for Ainsworth. After studying the parts carefully, he began the complicated job of assembly. Once he had finished the job, they hooked the machine up and it worked perfectly. In his early teens, after completing an apprenticeship with a clockmaker, he went into business on his own repairing clocks. In order to sell his "service" he would travel through an area playing his guitar to attract a crowd. In between songs, he would get in a plug for his clock repair. Still in his teens, he obtained a job in the Elgin watch factory at Elgin, Illinois. The exact details of his work with Elgin are rather obscure, but it is known that one of his duties was that of a "springer". This consisted of selecting, testing, installing and manipulating the hair springs of the watches, a very delicate and tedious job. Although the record is not definite, we do know Ainsworth worked for a period of time for the Union Copper Distilling Company of Calumet in Cook County, Illinois. (The company made and distributed bourbon, rye whisky, 188 proof alcohol, cologne spirits and French neutral spirits). Here he was employed as a steam engineer and family stories indicate his employers were so impressed by his mechanical ability that in a very short time, he was made Chief Engineer. He must have stayed with this job for several years and in February of 1874, at the age of 24, requested and received a letter of recommendation. (He also received an August 18, 1875 letter of recommendation from the Office of Roelle, Junker & Company, Distillers & Rectifiers located at 261 & 263 East Kinzie, corner Cass St. in Chicago. This letter was signed by the secretary of Union Copper Distilling Company located in Riverdale, Illinois). He next moved to Black River Falls, Wisconsin, where for a short time he worked for J. W. Cole and Company (Drugs, Paints, Oils and Fine Liquors) as a watch maker. During his time with Cole and Company, he worked with W. B. Woolsey, another watch maker whom he had met and worked with at the National Watch Factory in Elgin. Mr. Woolsey in his letter of recommendation states, ". . . he is the best man on the lathe that I ever saw in short he thoroughly understands a watch in every respect." It was also in Black River Falls that he met Elma E. Eastman, a young girl from New York who had arrived in Wisconsin to visit a sister. The Denver Post of January 2, 1917 leads to the belief that Ainsworth and Elma Eastman were married in Minneapolis, Minnesota. He remained in the employ of the Cole Company possibly through September of 1875. It is evident that through the preceding experiences, Ainsworth learned to be top-notch toolmaker and mechanical engineer. In later years, evidence of his designing and tool-making ability could be found around the Ainsworth factory in Denver in the tools which he built for the manufacture of the early balances. Some of these tools were still in use in the factory as late as 1965 and the family of his grandson, Robert Ainsworth, still has one of the original lathes built from "scratch" by Ainsworth sometime prior to 1900. In 1875 or 1876, the young couple came west, traveled through Denver and settled in Central City, Colorado. Upon his arrival in Central City, he turned to his watchmaking trade to earn a living and worked for various jewelers there. He soon developed a specialty cleaning and repairing Swiss Repeater watches, a very fine handmade Swiss watch which struck the hours, half-hours, and quarter-hours. This work led Ainsworth into contact with a variety of people, mostly miners and assayers, and it is believed that these associations eventually led him into the balance business. One source indicates that Richard Pearce, Nathaniel Hill's head metallurgist at the Boston and Colorado Smelter, one day needed an assay balance fixed and in order to avoid sending it back to England for repair, presented it to Ainsworth and suggested he try his hand at repairing it. In those days, Oertling, Becker and Troemner balances were shipped from their factories in England, Philadelphia and New York. When these balances would not function properly, they had to be returned to those cities, which constituted a wait of many months. Consequently, Ainsworth, in order to help the assayers, began repairing the assay balances and in time learned the "secrets of the trade." He determined that since assay balances were in great demand at that time, they could be made just as well in Colorado as in England, Philadelphia or New York and he proceeded to develop his ideas for manufacturing them. In the meantime, Ainsworth and his wife cultivated a business of making decorative chains from the native silver being produced from the mines in the area and indications are that, at least for a short time, those chains were the height of fashion in the socially prominent Central City. In 1877 the Ainsworths moved to Denver, probably to be closer to suppliers of materials he needed for making balances and to try to make more of his abilities as a watchmaker, repairman and machinist and his newly developed expertise in time lock repairing for banks. Although his primary sources of income were watchmaking, machining and time lock repairing for banks, he continued to develop his balance trade on the side. The Denver City Directory of 1879 lists William Ainsworth as a watchmaker for A. B. Ingols Jewelry and in 1880 and 1881 he is listed as an owner in the Swain & Ainsworth Machine Shop on 474 Larimer Street. It was in 1879 while serving as a watchmaker for A. B. Ingols that Ainsworth probably made his first balance. He began by buying a small hand planer and on this planer he machined the bed of a small engine lathe. He built the lathe in its entirety and then began the slow process of making his own taps and dies. He established his own standards of sizes and thread forms. It is also believed that he then constructed a milling machine. The first balance parts were turned out on the small lathe and miller with a great deal of hand work. The brass beams were laid out and sawed with a jeweler's saw and the balance cases were made of high grade African mahogany with a French polish finish. In 1882 Ainsworth had his watchmaking and balance shop at 248 16th Street. Several years later he located his "Watchmaker and Mane'g Jeweler" shop at 577 and 579 Lawrence St. This address eventually became his factory and home for many years. In 1887 a street re-numbering occurred and, although the factory and home remained in the same bulding at the same location, the address became 2151 Lawrence. Information regarding Ainsworth's early balances is, of course, quite scarce. A serial number record from #473 to #2027 is known, but it only provides a description; there are no dates. One assay balance is known with a number 090 inscribed on the beam. 090 doesn't fit any of numbers of the various models of balances built by Ainsworth, nor does it fit part numbers which were used from time to time and were two digit numbers. Since Ainsworth gained much of his early training in watch repairing where almost everything has a serial number, it is believed he may have begun his numbering system with 001. It is possible to date balance number 1000 at 1898, which would mean that Ainsworth built one thousand balances between 1880 and 1898. This works out that the company built approximately 50 balances a year. Since in 1899 the company built approximately 100 balances, 50 a year does not seem unlikely. Balance number 2027 was made in 1902, but unfortunately, there is a large gap in serial number information between 1902 and 1945. Since there were no balance theory and design textbooks available to Ainsworth, he made use of the experience and practice of other balance manufacturers. Drawing on the work of Paul Bunge of Hamburg, who in 1866 had proved a shorter beam in a balance does not necessarily mean less accuracy, Ainsworth began his own experiments with a short balance beam. One of Ainsworth's outstanding contributions to the industry were these experiments in shortening the balance beam, which effectivly quickened the assaying process. (The shorter the beam, the faster the oscillations). The early Oertling and early Ainsworth balances had beams as long as 10". Extremely long beams were used in the early days because the adjustment of the knife edges did not need to be as accurate on a long beam as they have to be on shorter ones; therefore, adjustments were much easier. They were, however, very slow in their oscillations. Balances were manufactured in the Ainsworth plant having beams only 4 inches long and possibly a few of only 3 1/2 inches. It was learned from these early balances that the very short beams are not as dependable and stable as the five-inch length which was eventually adopted as a standard, although as late as 1920 both 4-inch and 6-inch beams were available. It has been determined reasonably accurately that balance manufacturing, as well as the firm of William Ainsworth Balance Company, started in 1880 even though he continued with his watch repair and time lock service. In that year the personnel in the Ainsworth factory located at 348 16th Street (only a few doors from where Ainsworth worked as a watchmaker), consisted of William Ainsworth, an apprentice, a cabinet maker, and a mechanic. Again the wood of choice was mahogany; a former employee of the Ainsworth Company has stated that the mahogany used in the company's balances came from the Gold Coast (Ghana) of Africa. Ainsworth balances were almost immediately preferred by the local assayers. In spite of this acceptance, however, the problem of building sufficient volume to support a family with this infant industry was a tough one and Ainsworth found it necessary to hire out his services to keep the business going. It may be this situation that caused him to be listed as a watchmaker and machinist rather than a balance maker. It was also in the 1880s that he became well-known for his ability to clean and repair time locks in bank vaults, and he developed a good business maintaining the time locks in all the leading banks of Denver and the surrounding area. There is one story from the family that is well worth telling, for it shows us something of the character of William Ainworth. ". . . . a certain store manager engaged Ainsworth to clean and repair his safe and then refused to pay the mechanic his fee. Ainsworth quietly returned to the safe and performed an operation that later proved one of the most effective collective agencies devised by man. Several hours later the owner accosted Ainsworth and complained that he could not open his safe. 'I know you can't', Ainsworth replied amiably. 'Well, what's wrong?' the merchant wanted to know. Ainsworth, still amiably, replied that he had changed the combination. When the angry owner demanded the new combination, Ainsworth bargained, 'Pay me what you owe me and you'll get your combination'. Well, Bill Ainsworth got his money and the owner got his combination." As was the case in the eastern United States of Voland, Van Zelm, Kohlbusch (and perhaps to a certain extent Troemner) working for Becker before they went out on their own, so it was in the west that William Ainsworth provided the experience and perhaps the motivation for a number of prospective balance manufacturers. Of the five prominent western balance companies, all but one of the owners had at least some part of their training with William Ainsworth. They were Elmer Smith and Fred Thompson who would establish Smith & Thompson Balance Company (later to become the Thompson Balance Company), Albert Dahlberg and Hugo Franow who would establish the Denver Balance Company, and George Keller who would establish the Keller Balance Comany in Salt Lake City. The latter gave some training and opportunity to George Spiegel and Wilfred Huesser in their balance making endeavors. Their stories are told elsewhere in this book The Ainsworth Balance Company survived the panic of 1893, possibly due to the outside work of William Ainsworth in repairing clocks, watches, safes, etc. Sometime around 1894 or 1895, Mr. D. W. Brunton brought his newly patented Brunton Pocket Transit to William Ainsworth to manufacture. The first lot consisted of twenty-five instruments, and thus began the Brunton Pocket Transit business, which was to serve the company well into the 20th century. The success of the Brunton Pocket Transit may have contributed to the decision of Ainsworth Company to build and market surveying instruments. In any event, the work was started on surveying instruments around 1903 or 1904, but the first transits were not marketed until 1906. This continued until 1940, when the transit business was sold to Harry Glantz, who had been an instrument maker for Ainsworth. After that purchase, the transit business that had operated under the Ainsworth name became known as Rocky Mountain Instrument Company. Harry Glantz died around 1945 and his son Omar took over the business. The company was last listed in the Denver Business Directory of 1955. The Ainsworth Balance Company continued to grow and prosper and around 1899, William's two sons joined him and the company became known as Ainsworth and Sons. Robert G. Ainsworth was born in Pennsylvania on January 1, 1878 and Alfred W. Ainsworth on October 30, 1884. Both got their early training in the Ainsworth factory and it was a natural course of events that led them to join the firm in 1899. Some of the problems inherent in the assay balances of this time was the handling of the rider. The rider was a small "inverted V" shaped platinum weight that was placed at various indexes along the beam to subdivide the weight placed in the pan below. It gave the operator a much more accurate weighing with a minimum of handling of the larger gram weights used in the pans. The assayer, however, was limited to the weight of a particular rider and if he wanted to change that rider, he had to open the case and very carefully replace one rider with another. To handle this problem, the idea of the multiple rider was developed. With a multiple rider attachment, the operator no longer had to open the case to change weights; he merely turned a rod and replaced one rider weight with another. It has been claimed that the Ainsworth Company was the first to develop and patent a multiple rider carrier; however, the records of the U. S. Patent office reveal that Fred W. Thompson filed his patent for a multiple rider carrier on December 26, 1903 (patent no. 768,829) while Robert G. Ainsworth filed his patent on May 8, 1905. The two multiple rider carrier ideas were different in design, but achieved the same goal. Sometime around 1910, Ainsworth & Sons began a major shift from manufacturing assay balances to manufacturing analytical balances. These had been made and sold prior to this time, but not in any great number. The change in emphasis was probably due to several reasons: a general decline in mining, the fact that assaying was more often done in a central assay office rather than many separate assay offices, and the fact that the demand for general scientific research was increasing the demand for more and better analytical balances. This production and development eventually led to Ainsworth's first micro-balances. Balances were developed that would weigh in a vacuum and under pressure, that would show the loss of weight of a drop of alcohol as it evaporated, that would register the difference in weight created by the a sunbeam striking a piece of paper or the weight of a pencil line on a piece of paper. Around 1916, the company began receiving orders for balances, weights, Bruntons, etc., due to the preparation for World War I. William Ainsworth died January 1, 1917, leaving the management of the company in the hands of his two sons and his wife, Elma E. Ainsworth. From 1918 until the 1930s the company went through a period of wide diversification. These included manufacture of a Dodge automobile transmission, spotlights, tire gauges, automobile signaling devices, perfume atomizers, toilet flush valves, moving picture machines, smoking pipes, furnace grates, valve-facing tools for automobiles, seismographs, mining carbide lamps...