The Design of Aircraft Instruments: The Reasons Why They Must be Specially Produced and Attempts at Adaptation Result in Failure Available to Purchase

THE design of aircraft instruments is a highly specialized art, and unless the principles are well understood a great wastage of time and money can occur before a successful instrument is evolved. The reasons for this will be clear after a consideration of the conditions which must bo satisfied to ensure useful service. These may be summarized under the following headings:—