From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Two-page pamphlet describing Amsler's Planimeters and Crosby Indicators, including models, features, purpose, and pricing.
| Identifier | ExFiles\Box 52\1\ Scan004 | |
| Date | 1st September 1926 | |
| L 16 Amsler's Planimeter. Planimeter No. 1. No. 1 represents the Planimeter in its simplest form, as designed to measure areas in square inches and decimals of a square inch; it has but one wheel. An area of 10 square inches may be measured. Planimeter No. 2. No. 2 represents the same instrument with the addition of the counting disc G, the figures on which represent tens and mark complete revolutions of the roller-wheel. By this means larger areas can be measured with facility. Planimeter No. 3. No. 3 Planimeter differs somewhat in design from the two previously described, but has the same recording mechanism as the No. 2. It is capable of measuring larger areas, and, by means of an adjustable arm, giving the results in various denominations of value, such as square decimetres, square feet and square inches, also of giving the average height of an indicator diagram in fortieths of an inch, which makes it a very useful instrument in connection with steam engine indicator work. No. 1 Planimeter, in velvet-lined case ... ... Price £5 12 0 No. 2 " " " ... ... " 5 16 0 No. 3 " " " ... ... " 6 18 0 CROSBY VALVE & ENGINEERING Co., Ltd., 41/42, FOLEY STREET, LONDON, W.1. Pamphlet No. L 1205 Sept. 1926. (Superseding Pamphlet No. 1204). CROSBY INDICATORS. Suitable for . . . Steam, Gas or Oil Engines. Pumps and Compressors. Hydraulic and Ammonia Plants. Ordnance Tests, &c. Special Features . . . Extreme lightness of moving parts. Simplicity of Construction. Convenience of Manipulation. Nicety of Adjustment. Excellence of Workmanship. Accuracy of parallel motion. Careful rating of the Springs. The purpose of an Engine Indicator is to obtain a reliable diagram showing the action of Steam, Gas or Air in an engine cylinder. A careful study of indicator diagrams, taken under different conditions of load, pressure, &c., reveals many particulars of supreme importance to Engine Builders, Engineers and Owners of Power Plant, and from the knowledge thus obtained efficiency may be increased and great economies effected. To obtain results which can be relied on it is essential that the indicator should be correctly designed and of the finest possible construction and workmanship. The Crosby Indicator has for very many years been regarded as the Standard Indicator, on account of the correctness and simplicity of its design and the excellence of its workmanship. Every part is perfectly adapted to its work and finer results can be obtained with it than with any other indicator. Its smaller size and weight protect it from accident, and so contribute to its durability and to the facility with which it can be handled. CROSBY VALVE & ENGINEERING Co., Ltd., 41/42, FOLEY STREET, LONDON, W.1. | ||