The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 467
onclusion,— I hereby declare that I lay no claimto the invention of any of the mi.\tures herein referred to, nor to the methodof preparing them ; such mixtures, and the processes of preparation, beingalready well known. But what I claim, as my invention, is, their applicationto the purposes herein… … MR. DENTONS A LEVEL. The annexedwoodcut showsthe instrument—its figure willexplain the rea-son of its beingcalled the ALevel; whilethe observerwill compre-hend at a glanceits portabilityand the facilitywith which itmay be usedeither on thesurfar^e or in the trench. The b ir B turning up on a hinge…
Architecture · Civil engineering · Science
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