首页 › The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose › 第 37 章 Section 52.--LEVELLING AND PLUMBING. The common spirit level and plumbline are ordinarily employed, as also
the surveyor’s telescope and spirit level or “Dumpy.”
=986. Gravitation level.=
=987. Plumbline and square.=
=988. Water tube level;= the tube may be carried a long distance and
round corners, &c., in any direction below the water level.
=989. Spirit level plumbing square.=
The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose · 第 37 / 46 章