dumpy level การใช้

• Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level.
• During night time, the dumpy level is used in conjunction with an auto cross laser for accurate scale readings.
• The dumpy level was developed by English civil engineer William Gravatt, while surveying the route of a proposed railway line from London to Dover.
• The route was surveyed using a Wye level ( an early version of a dumpy level ), again the first recorded use in America.
• These instruments included an alidade, dumpy level, theodolite, Gunter's chain ( which was replaced by a steel tape ) and a solar compass or a vernier compass.
• Apprenticed as a mechanical engineer in London from aged 15, after interview he worked with South Eastern Railway to Dover, he devised the more transportable dumpy level, which is now universally employed.
• The lab has numerous surveying instruments, including dumpy levels, auto levels, total stations ( EDM ), digital levels, laser devices, and GPS units, and two-way radios for team communication.
• Although the use of this sight may be novel for levels, the idea of using a mirror to sight a spirit level bubble from a more convenient position has long been used with surveyor's telescopic dumpy levels.
• In the first chapter of Thomas Hardy's 1887 novel " The Woodlanders ", the narrator states, " He knew every subtle incline of the ten miles of ground between Abbot's Cernel and Sherton the market town to which he journeyed as accurately as any surveyor could have learnt it by a Dumpy level ."