ice-houses 15/16
  Spinfield, Marlow, Bucks 12/39
Ickleford, Beds; plans for station 11/14, 15
Iffley Mill, Oxon 10/3
ignition, 'make-and-break' 6/12
inclined plane boat lift, Foxton Locks 9/13
India Rubber, Gutta Percha and Telegraph Works Ltd, Silvertown, London;
    dynamo Type K, No 967 16/13
Inkpen, W. Berks; brickworks 16/5
inns
  breweries 13/28; 14/11, 12; 15/4
  clay tobacco pipes found near 8/5
  Towcester area 7/4, 5
Insey, Henry, of Nottingham; horizontal steam engine 6/12
Instone, Eric 1/4; 3/4
  on dovecotes 9/11-12, 17
  'Northampton Iron Foundries' 12/2-8
insurance marks 14/30
inter-county cooperation 2/1-2; 3/1
International Farmall tractor 6/12
International Foundry Congress 13/7
International Molinological Society 14/10
Ipsden House, Oxon; donkeywheel 4/2
Irchester, Nhants
  ironstone quarries 9/10; 10/14-15, 15-16; 11/18
  quarry railways 10/15; 14/29
  Roman ironworking 11/17
  watermills 12/28
  see also Knuston
Irlam works, Lancashire Steel Corporation 11/25
iron, types of
  basic, Corby 11/31
  spongy, for filtering, Towcester 11/26
Iron Horse Railway of Leighton Buzzard, Beds 7/11; 10/14
Iron & Steel Holding and Realisation Agency 11/33
Iron Trunk Aqueduct, Bucks 2/4; 5/5; 8/5
ironstone quarries
  brickworks to use clay dug from 13/13-14
  early methods and equipment 4/4
  pioneering use of mechanical diggers 11/30-1
  and sunken fields 5/3; 6/8
  see also under Addington; Banbury; Barton Seagrave; Blisworth; Broughton;
      Burton Latimer; Cogenhoe; Corby; Cranford; Cransley; Duston;
      Earls Barton; Easton Neston; Fawler; Finedon; Gayton; Glendon;
      Hardingstone; Harringworth; Heyford; Hook Norton; Hunsbury Hill;
      Irchester; Irthlingborough; Islip; Kettering; Lincolnshire;
      Loddington; Nassington; Newton; Ringstead; Storefield;
      Stowe Nine Churches; Towcester; Twywell; Warren Hill; Wellingborough;
      White Hill Lodge; Woodford; Wootton; Wroxton
ironworking
  annual output of Northamptonshire, 1866-1944 11/18
  bloomery, Finchampstead 8/14
  calcining 9/10; 10/15; 11/23, 28, 30, 31-2
  medieval and earlier 11/17, 26; 12/9-10, 40; 13/28, 30; 15/12
  Northamptonshire 1/4; 11/17-35; 12/2-8
  pattern shop and patterns, Bucklebury 13/6
  recession of late 1920s 11/29, 32
  Siemens Direct Process 7/6; 11/26
  Staffordshire use of Nhants ore 11/17, 20
  'thick gas' produced during 11/28
  works names on castings 12/6
  in World Wars 11/26, 31, 33
  see also blast furnaces and under Banbury; Buckingham; Bucklebury; Corby;
      Cranford; Cransley; Desborough; Finedon; Heyford; Hook Norton;
      Hunsbury; Irthlingborough; Islip; Kettering; Nassington; Northampton;
      Stanton; Stowe Nine Churches; Towcester; Wantage; Wellingborough
irrigation works, Buscot Park, Oxon 6/2; 7/2-3
Irthlingborough, Nhants
  brewery 14/14, 17
  brickworks 13/11, 17-18
  cement works 13/18
  ironworks 11/19, 22; 14/9
  ironstone quarries 11/18; 13/17; 16/1A
  railways 11/22, 30; 12/39; 13/17
  tannery 13/17
  tramway 13/17
  watermills 12/28
Isham, Nhants
  dovecote 9/12
  watermills 12/21, 28
Islip, Nhants
  blacksmith's shop 8/15
  Drayton Estate (Lowick) 8/15
  Islip Iron Co 11/22, 23, 31; 16/1A; ironstone mines and quarries 9/14;
      10/6, 7-8, 9-11, 15, 16; 11/22-3; ironworks 6/15; 10/15, 16; 11/19,
      22-5; tramways 6/15; 9/14, 17; 10/6, 8, 15, 16; 12/40
  rush collar and matting manufacture 8/15
  toll house on A604 6/15
  watermills 12/21, 28; 15/9
Islip Company (C.H.Plevins & Co) 11/23
Ivinghoe, Bucks; watermills
  Beesleys, near Bell Inn 4/3
  Ford End Farm 4/3-4; 6/14; 9/10
Ivinghoe Aston, Bucks; limeworks 9/10