Suffolk and Berkshire, Henry Charles Howard, Earl of, 1833-1898, Peek, Hedley, Aflalo, Frederick G. (Frederick George), 1870-1918 · London : Lawrence and Bullen · leaf 69
dder, leading to hori-zontal passage.f. Explorer on raft. N.B.—The safety rope referred to inletterpress has been purposely omittedin order not to cause a confusion ofropes in a drawing on such a smallscale ; in practice, it would pass overanother pulley adjacent to the onemarked C on the diagram.… … CAVE EXPLORATION THE ENCVCLOP-^DIA OF SPORT 51 croivbars, planks, strong carpentry tools, &c., arealso requisite. The following instruments are necessary forsurveying : aneroid barometer, thermometer,prismatic compass, clinometer, surveying tape orchain. A telephone is probably the best means…
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