Cadman Joins Anglo-Persian
Leaves government service and joins Anglo-Persian as a technical adviser during a period of major expansion.
Role range: 1901-1935 – 1921-1941
Historical biography archive · Updated 2026-11-03
John Cadman Biography and Timeline
Follow John Cadman through 34 dated historical records for Great Britain.
John Cadman, historical timeline
A chronological timeline drawn from matching World History Database records.
34Distinct records
1 of 1Page
1921–1935Years on this page
1921
Standard Oil Compromise Negotiated
Helps negotiate a compromise with Standard Oil interests over participation in Persian petroleum ventures.
Role range: 1901-1935 – 1921-1941
1922
Cadman Becomes Company Director
Becomes a director as Anglo-Persian strengthens its technical and managerial organization.
Role range: 1901-1935 – 1922-1941
1924
Cadman Reorganizes Persian Operations
Undertakes consultations in Persia aimed at centralizing and clarifying management of Anglo-Persian's local operations.
Role range: 1901-1935 – 1921-1941
1925
Cadman Becomes Vice-Chairman
Becomes vice-chairman and gains greater responsibility for Anglo-Persian strategy and organization.
Role range: 1901-1935 – 1925-1941
1926
Masjed Soleyman Field Renamed
The original Maidan-i-Naftun producing field is formally identified as Masjed Soleyman.
Role range: 1901-1935 – 1925-1941
Masjed Soleyman Production Exceeds Four Million Tons
Annual production at the original Persian field rises above four and a half million long tons.
Role range: 1901-1935 – 1925-1941
1927
Cadman Elected Anglo-Persian Chairman
Is elected chairman after returning from discussions with the newly crowned Reza Shah.
Role range: 1901-1935 – 1927-1941
Naft-e Shah Oilfield Discovered
Anglo-Persian discovers the Naft-e Shah field in western Persia, extending production beyond Masjed Soleyman.
Role range: 1901-1935 – 1927-1941
1928
Consolidated Petroleum Company Arrangement
Anglo-Persian and Shell interests create a joint distribution structure for markets across Africa and the Middle East.
Role range: 1901-1935 – 1927-1941
Gachsaran Oilfield Discovered
Anglo-Persian discovers oil at Gachsaran during its expanding exploration programme in southwestern Persia.
Role range: 1901-1935 – 1927-1941
Haft Kel Oilfield Discovered
Anglo-Persian discovers the large Haft Kel field, which becomes a major new source of Persian crude.
Role range: 1901-1935 – 1927-1941
International Oil Coordination Agreement
Joins other major oil companies in an international agreement intended to limit destructive competition and balance supply.
Role range: 1901-1935 – 1927-1941
1929
Haft Kel Pipeline Completed
A pipeline from Haft Kel is connected near Ahvaz to the main route carrying crude toward Abadan.
Role range: 1901-1935 – 1927-1941
1930
Abadan Refinery Reaches 100000 Barrels Daily
Abadan refinery capacity reaches roughly one hundred thousand barrels per day after sustained expansion.
Role range: 1901-1935 – 1927-1941
Haft Kel Production Reaches 20000 Barrels Daily
Haft Kel production reaches roughly twenty thousand barrels per day as the field becomes a major producer.
Role range: 1901-1935 – 1927-1941
Persian Output Reaches 125000 Barrels Daily
Combined production from major Persian fields reaches roughly one hundred twenty-five thousand barrels per day.
Role range: 1901-1935 – 1927-1941
Persian Workforce Exceeds 20000
More than twenty thousand people are employed by Anglo-Persian in Persia as production and refining expand.
Role range: 1901-1935 – 1927-1941
1931
Oil Royalty Revenue Collapse
Falling oil prices and the global depression sharply reduce royalties paid to the Persian government.
Role range: 1901-1935 – 1927-1941
Persian Oil Production 5730498 Tons
Company production reaches 5,730,498 long tons despite the global petroleum market downturn.
Role range: 1901-1935 – 1927-1941
1932
Oil Dispute Referred to League of Nations
The British government refers the Anglo-Persian concession dispute with Persia to the League of Nations.
Role range: 1901-1935 – 1927-1941
Persian Oil Production 6445808 Tons
Company output increases to 6,445,808 long tons while the concession dispute remains unresolved.
Role range: 1901-1935 – 1927-1941
1933
New Persian Oil Concession Signed
Signs a new concession replacing the 1901 D'Arcy agreement after negotiations with the Persian government.
Role range: 1901-1935 – 1927-1941
Concession Area Reduced to 100000 Square Miles
Accepts a reduced concession area of one hundred thousand square miles under the 1933 settlement.
Role range: 1901-1935 – 1927-1941
Concession Extended to 1993
Secures a sixty-year concession running to 1993, extending company rights well beyond the original D'Arcy term.
Role range: 1901-1935 – 1927-1941
Discounted Domestic Oil Sales Agreed
Agrees to sell petroleum for internal Persian consumption at specially favourable prices.
Role range: 1901-1935 – 1927-1941
Minimum Persian Royalty Guaranteed
Accepts a guaranteed minimum annual payment of seven hundred fifty thousand pounds to the Persian government.
Role range: 1901-1935 – 1927-1941
Oil Dispute Arbitration Procedure Agreed
Accepts a formal arbitration procedure for future disputes between the company and the Persian government.
Role range: 1901-1935 – 1927-1941
Persian Income Tax Payment Arrangement
Agrees to make annual payments in lieu of Persian income tax under the new concession.
Role range: 1901-1935 – 1927-1941
Persian Oil Production Exceeds Seven Million Tons
Company production reaches 7,087,000 tons and payments to Persia total about 1,785,000 pounds.
Role range: 1901-1935 – 1927-1941
Persian Oil Training Grant Established
Agrees to provide an annual grant for professional education of Persian nationals in the petroleum industry.
Role range: 1901-1935 – 1927-1941
1934
Kermanshah Petroleum Company Registered
Registers the Kermanshah Petroleum Company as a subsidiary for development of the Naft-e Shah region.
Role range: 1901-1935 – 1927-1941
Haft Kel Output Exceeds Two Million Tons
Haft Kel produces more than two million tons annually as Anglo-Persian expands after the new concession.
Role range: 1901-1935 – 1927-1941
1935
Anglo-Persian Renamed Anglo-Iranian Oil Company
Renames the company Anglo-Iranian Oil Company after Persia formally adopts Iran as its international name.
Role range: 1901-1935 – 1927-1941
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.