Long and are interposed between the heavy iron augerstem carrying the bit and the upper rod, known as the sinker-bar.
The men now take hold of the bull-wheels and draw up the slack until the sinker-bar rises, the ' play ' of the jars allowing it to come up 13 in.
If now the vertical movement of the walking-beam be 24 in., when 'it starts on the up-stroke the sinker-bar rises 4 in., and the cross-heads come together with a smart blow, then the auger-stem is picked up and lifted 20 in.
- Sinker, Testamenta XII Patriarcharum (1869); [this work gives b in the text and a in the footnotes; subsequently (1879) Sinker issued an Appendix with variations from cg]; Charles, The Greek Versions of the Testaments of the XII.
Second only to the compass in its value to the sailor is Thomson's sounding apparatus, whereby soundings can be taken in 100 fathoms by a ship steaming at 16 knots; and by the employment of piano-wire of a breaking strength of 140 tons per square inch and an iron sinker weighing only 34 lb, with a selfregistering pressure gauge, soundings can be rapidly taken in deep ocean.