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Sinclair Pearn (c1848-1933) of Frank Pearn and Co
1851 Living at 11 Cooper Street, Manchester: Richard Pearn (age 35 born Teignmouth), Tailor employing 5 men. With his wife Elizabeth Pearn (age 32 born Leigh) and their four children; Fredrick Pearn (age 7 born London); Emma Pearn (age 4 born London); Sinclair Pearn (age 2 born Manchester); and Frank Pearn (age one month born Manchester). Also a visitor and a servant. 
1891 Living at Burnage Lane, Withington, Manchester: Sinclair Pearn (age 42 born Manchester), Engineer - Employer. With his wife Mary Pearn (age 41 born Manchester) and their four children; Harold W. Pearn (age 14 born Manchester); Ethel K. Pearn (age 13 born Manchester); Arthur S. Pearn (age 11 born Levenshulme); and George E. Pearn (age 9 born Levenshulme). Also one visitor and one servant.
1911 Living at Burnage House, Withington, Manchester: Sinclair Pearn (age 62 born Hulme), Engineer Mechanical - Employer. With his wife Alice Pearn (age 44 born Portishead, Som.) and their four children; Richard William Pearn (age 36 born Trafford, Lanc.), Gentleman (private means); Ethel Kelsey Pearn (age 33 born Trafford, Lanc.); Arthur Sinclair Pearn (age 32 born Trafford, Lanc.), Pattern Maker; and George Ernest Pearn (age 29 born Trafford, Lanc.), Draughtsman. Two servants.
"The Late Mr. Sinclair Pearn.—We note with regret the sudden death, on October 10, of Mr. Sinclair Pearn, chairman and joint managing director, with Mr. H. W. Pearn, of Messrs. Frank Pearn and Company, Limited, engineers, West Gorton, Manchester, 12. Mr. Sinclair Pearn, who was in his eighty-fifth year, founded the firm together with his brother, the late Mr. Frank Pearn, some sixty years ago. He was actively engaged in the business until the end and attended the works on October 9, apparently in his usual robust health, but died suddenly the next day. He was more particularly concerned with the commercial side of the business and was keenly interested in costing systems. In 1905, he published a book entitled Workshop Costs for Engineers and Manufacturers."
Mr. SINCLAIR PEARN, whose death occurred suddenly at his home in Manchester on October l0th, in his eighty-fifth year, was, together with his younger brother Frank - who died some years ago - instrumental in founding the engineering firm of Frank Pearn and Co., Ltd., Gorton. Mr. Pearn was a wonderfully active man for his years and attended at the works as recently as the day preceding his death. He was particularly concerned with the commercial side of the business, and was keenly interested in costing systems, on which subject he wrote a book entitled "Workshop Costs for Engineers and Manufacturers," in 1905. The firm's reputation as pump makers is world-wide, and the design of the horizontal boring and facing machine, now built by two other firms, originated at Messrs. Pearn's works. Mr. Pearn was a very keen amateur gardener, and by his association with a well-known organisation in Manchester was largely instrumental in raising large sums of money for charitable causes.