As you can well imagine, seeing the first steam powered earth mover would have been a very big deal.深海捕鱼大师 It actually frightened many people who saw it in action for the first time.
深海捕鱼大师At least two descendents of John Otis, who emigrated from England in 1631, and settled at Hingham, Massachusetts, were destined to make significant inventions, although history books only give due acknowledgment to the one associated with the creation of the passenger lifts.
深海捕鱼大师William S. Otis, however, born in 1813 as the son of the Postmaster at Pelham, Massachusetts, is no less worthy of fame. Williams’ family moved in either 1828 or 1829 to Philadelphia, Pennsylvania, where in 1833 he joined the contracting firm of Carmichael & Fairbanks of which the senior partner, Danielle Carmichael, was his brother-in-law and by the following year he was himself a partner.
深海捕鱼大师When Carmichael, Fairbanks and Otis had a contract to work on the construction of the Boston and Providence Railroad (later the New York, New Haven and Hartford) in 1835, William Otis made his temporary home at Canton, Massachusetts. Here, not only did he meet and marry a local girl, but also – with the help of a local man, Charles Howe French, recently out of apprenticeship to a millwright – he designed and built the prototype of the world’s first successful, powered, dry land excavator. This, built in a machine shop near the Massapoag Brook, was probably based on the quarry derrick principle and is believed to have had a mast supported by cables, a luffing-type dipper arm and bucket hinged to a boom, a double drum hoisting engine, and boom swing achieved by men at the sides pulling on ropes. The machine was clearly not easily moved as the derrick and excavating equipment were not fixed to a readily mobile frame also carrying the engine.
深海捕鱼大师This Canton-built prototype was later used by Charles French on construction of the Norwich and Worchester railroad; and was possibly the same machine, incorporated into a dredge designed by Hosea T. Stock, which Charles French and Daniel Carmichael operated as contractors widening the Welland Canal, Ontario, in the 1840s and 1850s.
William Otis returned to Philadelphia in 1836, intent on building an improved version of his excavator himself with parts made by local machine shops. In the event he entrusted the complete erection of seven machines to Garrett and Eastwick, builders are locomotives and stationary engines, with premises on 12th St. The first Philadelphia built Otis shovel was produced in 1837 and by the time the second emerged the firm’s name had become Eastwick and Harrison; Joseph Harrison Junior, the skilled foreman who is likely to have contributed much to perfecting mechanical details of the shovel’s design, had bought out Garrett’s interest.
Although William Otis had filed his original patent application on the 15th of June 1836, a fire in the patent office destroyed this and a second application dated 27th of October 1836 was allowed on 24th of February 1839 and numbered as 1089. In this new restored patent application for a ‘Crane excavator for excavating and removing earth’ the inventor did not make any claim to the mere using other scraper by means of a train, this having been done before.
The Otis shovel was the first excavator to break and remove material by employing a single bucket with power thrust for adjusting the radius of a cut above, and to a limited extent below, ground-level. It was self-propelled and exhibited the three basic digging features still present in excavators equipped as a shovels: these are hoist, crowd (or racking) and slew (or swing).
深海捕鱼大师Philadelphia built Otis shovels had a wide timber frame supported on cast iron traveling wheels which ran on temporary rails; the frame carried the boiler, engine and gears as well as all the excavating equipment and had projections with screw jacks for added stability when working. A triangular timber boom was supported by a pivoted, tubular, cast iron center post with a semicircular slewing ring attached to its top.
Power for hoisting was taken by chain from a grooved drum, through the inside of the center post to pulleys on the post and boom and then down to the bucket (scraper). A shaft with bevel wheels at each end carried a power down from the post pulley to another shaft between the main lower braces of the boom which, with its appendages, was the key feature of the Otis shovel. A drum fitted to this shaft carry chains in reversed direction attached to opposite ends of the dipper arm: this device provided controlled thrust with the capability of absorbing shocks, to the arm and its bucket of around 1 1/4 yd.³ capacity.
深海捕鱼大师Up to 180° of slew was achieved by means of a chain from another drum taken round the sloughing ring. At the rear of the machine, a vertical wood-burning boiler provided low-pressure steam to a single cylinder vertical engine, with an approximate a bore of 23 cm (9 inches) diameter and 30 cm (1 foot) stroke, fitted at its front; this resulted in units ranging from about 8 to 20 hp. Contemporary accounts indicate that an Otis shovel could do the work of between 60 and 120 men: it’s estimated output was around 100 yd.³ of material per hour.
Of the seven Philadelphia-built shovels only two remained in North America. There are suggestions that the first work undertaken by one of these was on the Baltimore and Ohio Railroad in Maryland, but the first incontrovertible use of a powered excavator was in 1838 at Springfield, Massachusetts when Carmichael, Fairbanks and Otis were building a link of the Western Railroad (later Boston and Albany) to Worchester. A local newspaper, referred to the Otis shovel as ‘a specimen of what the Irishmen call digging by stame’.
深海捕鱼大师The writer obviously felt Isaiah’s prophecy – immortalized by Handel in the Messiah oratorio – was coming to pass, ‘For cutting through a sandhill this steam digging machine must make a great saving of labor. The hills are laid low, and the valleys made high’.
深海捕鱼大师This shovel worked on the Western Railroad for some three years and it was during construction of a later extension of the line to Chester that, in 1839 at Westfield, William Otis died at the age of 26.
In 1841 one of the shovels was at work in Troy, New York, and later that year and during 1842 Otis shovels were operating at Brooklyn, New York, excavating and filling swampland to make the city park. Justification for the use of the steam shovel was given by members of the American Institute after visiting the work site,
They said, “the masses of unruly men collected on our public works will be disbursed by its use, and compelled to till the land, thereby making them good and quiet citizens”. (image a journalist writing THAT in modern times!)
深海捕鱼大师It is likely that one or both machines were used later in the 1840s on the Atlantic Docks project, also in Brooklyn, as the shovels’ owner by then, Daniel Carmichael, was a contractor. Subsequent records of the use of the two Philadelphia built shovels are vague: it appears the last one was broken up during the early 1900s, following a record of one being overhauled and about 1893 at Omaha, Nebraska.
Excavators entered the world trade right from their inception. By early in 1842 one was at work in England near Brentwood, Essex, on the eastern counties Railway. John Duncan, who had been granted an English patent presumably under some agreement, was responsible for its introduction and John Braithwaite was entrusted with the construction and licensing of further machines for the UK and Europe. There is, though, no evidence of Otis machines being made outside North America. In 1845 one improved by J. B. Hyde was mounted on a scow and used as a dredge in England, and in the following year and Otis shovel was employed at Hull, Humberside, on excavating the Victoria Dock, but these reports may well refer to the original imported unit.
深海捕鱼大师Representatives of Russian authorities saw the Otis shovel at work on the Western Railroad in 1839: the result was that the railway company’s then consulting engineer, Maj. George G. Whistler (father of the famous portrait painter) was appointed consultant for the construction of the St. Petersburg (Leningrad)-Moscow railway. The first of the four Otis shovels was shipped to Russia, via France, in 1842, with the others following in 1843