The Structural Engineer > Archive > Volume 2 (1924) > Issues > Issue 12 > Discussion on Paper Entitled "Measurement of Air Supply to Rotary Kiln"
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Discussion on Paper Entitled "Measurement of Air Supply to Rotary Kiln"

Mr. F. Lindstead, replying to the discussion on his paper, said, “I am aware that this is not the time nor place to reply to the criticism of Mr. Deane, but since the opportunity presents itself I beg to reply that when I mentioned in this paper that the ordinary U tube manometer was not suitable for measuring the small differences in the height of head of water due to smail pressure, I assumed that the engineer interested in this class of work would be familiar with the tilting manometer used by the author, and which has now been in use and on the market for some years, and is more accurate and sensitive than the one described and used by Mr. Deane; it is also portable and compact which is a great advantage when used on a works, and it also would not be practical to use methylated spirits as used by Mr. Deane, in the place of water in the manometer in the neighbourhood of a rotary kiln owing to evaporation caused by the heat from the kiln. A description of the tilting manometer will possibly be of use here. As will be seen from the sketch the manometer consists of a U tube 1, 2, 3, provided with stop cock 4, and microscope D mounted on a frame A, which is supported on three steel points 5, one of these points being the centre of the micrometer wheel C. The frame A is supported on the steel points 5 on the frame B. The microscope D is supplied with a horizontal hair line which is sighted on the water level or meniscus in the limb 2. The pressure is applied to the ends of the limbs 1 and 2, and the micrometer wheel C is rotated until the hair line in the microscope D again corresponds to the water level in the limb 2. The head is read off on the micromefer wheel C and scale E; this reading requires multiplying by a constant depending on the dimensions of the instrument which gives the actual head of water. For a constant pressure this instrument can be read to 0.001 inch head of water. The author has used this instrument together with others of similar type with entire satisfaction.