21.02
Manual telephone switchboard
an operator joins any two telephones with a cord and a plug
AWhat it needs
Needs 228 other products in all, 3 of them directly.
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- 21.02 Manual telephone switchboardKnowledge Year 58 needs 228 products
- 14.07 Circuit hardwareMaking Year 39 needs 158 products
- 05.28 Soft solder and solderingMaking Year 3 needs 46 products
- 05.06 Open moulds and cast copper ingotsMaking Year 2 needs 43 products
- 04.22 Refractory clay mixMaking Year 2 needs 23 products
- 04.02 Clay pit and prepared clayMaking Year 1 needs 16 products
- 02.17 BasketsMaking Year 1 needs 4 products
- 02.03 Stone knives, scrapers and engraving pointsMaking Year 1 needs 3 products
- 02.01 Knapping kitMaking Year 1 needs 2 products
- 01.02 HammerstoneMaking Year 1 raw materials only
- 01.03 Sharp stone flakeMaking Year 1 needs 1 product
- 02.25 Antler pick, bone shovel and stone hoeMaking Year 1 needs 14 products
- 02.06 Sinew thread and rawhide lashingMaking Year 1 needs 9 products
- 01.15 Fire-hardened spear ⚠Making Year 1 needs 6 products
- 01.03 Sharp stone flakeshown above ↑← shown at left
- 01.08 First fire and stone hearthMaking Year 1 needs 5 products
- 01.06 Tinder and kindling storeMaking Year 1 raw materials only
- 01.07 Bow-drill fire setMaking Year 1 needs 3 products
- 01.03 Sharp stone flakeshown above ↑← shown at left
- 01.05 Twisted plant-fibre cordMaking Year 1 needs 2 products
- 02.03 Stone knives, scrapers and engraving pointsshown above ↑← shown at left
- 02.08 Hafted stone axe ⚠Making Year 1 needs 13 products
- 02.05 Pitch glueMaking Year 1 needs 6 products
- 02.06 Sinew thread and rawhide lashingshown above ↑← shown at left
- 02.07 Ground stone axe headMaking Year 1 needs 2 products
- 01.02 Hammerstoneshown above ↑← shown at left
- 02.04 Sandstone grinding slabMaking Year 1 needs 1 product
- 04.10 Kiln-fired potteryMaking Year 1 needs 22 products
- 04.03 Hand-built potsMaking Year 1 needs 17 products
- 04.09 Updraft kilnMaking Year 1 needs 21 products
- 04.02 Clay pit and prepared clayshown above ↑← shown at left
- 04.04 Pit-fired potteryMaking Year 1 needs 18 products
- 04.08 Sun-dried mud bricksMaking Year 1 needs 18 products
- 02.10 Wooden wedges and maulMaking Year 1 needs 14 products
- 04.02 Clay pit and prepared clayshown above ↑← shown at left
- 05.05 Smelted copperMaking Year 2 needs 42 products
- 04.24 CruciblesMaking Year 2 needs 24 products
- 04.27 Forced-air charcoal furnaceMaking Year 2 needs 31 products
- 04.07 Charcoal clampMaking Year 1 needs 16 products
- 04.25 Clay air nozzles (tuyeres)Making Year 2 needs 24 products
- 04.26 Bag bellowsMaking Year 2 needs 14 products
- 02.15 Scraped, brain-tanned and smoked hidesCloth Year 1 needs 8 products
- 02.16 Sewn hide clothing, shoes, bags and water skinsCloth Year 1 needs 13 products
- 05.04 Ore dressing floorMaking Year 2 needs 24 products
- 01.02 Hammerstoneshown above ↑← shown at left
- 02.24 Carved wooden bowls and troughsMaking Year 1 needs 14 products
- 05.03 Fire-set open-cut mine ⚠Making Year 2 needs 22 products
- 01.08 First fire and stone hearthshown above ↑← shown at left
- 02.12 Lever, log rollers and sledgeMaking Year 1 needs 15 products
- 02.08 Hafted stone axeshown above ↑← shown at left
- 02.11 Three-strand ropeMaking Year 1 needs 3 products
- 02.25 Antler pick, bone shovel and stone hoeshown above ↑← shown at left
- 05.01 Ore sample collection and simple testsMaking Year 2 needs 20 products
- 02.25 Antler pick, bone shovel and stone hoeshown above ↑← shown at left
- 02.28 Resource map of the islandKnowledge Year 1 needs 18 products
- 02.15 Scraped, brain-tanned and smoked hidesshown above ↑← shown at left
- 02.26 Dugout canoe and paddles ⚠Making Year 1 needs 16 products
- 05.08 Smelted tinMaking Year 2 needs 41 products
- 05.25 Smelted lead ⚠Making Year 3 needs 41 products
- 10.25 BrassMaking Year 25 needs 43 products
- 11.41 Hard rubberMaking Year 28 needs 154 products
- 11.39 Vulcanised rubber ⚠Making Year 28 needs 153 products
- 07.32 Refined sulphur ⚠Making Year 7 needs 62 products
- 06.25 Hammered iron sheet, pans and griddlesMaking Year 5 needs 61 products
- 06.07 Iron hammers, tongs and anvilMaking Year 3 needs 60 products
- 06.05 Wrought iron barMaking Year 3 needs 57 products
- 05.12 Bronze hammers and anvil blockMaking Year 2 needs 47 products
- 05.09 BronzeMaking Year 2 needs 45 products
- 05.10 Two-piece moulds with clay coresMaking Year 2 needs 24 products
- 05.13 Bronze tongs and crucible liftersMaking Year 2 needs 48 products
- 06.04 Iron bloomMaking Year 3 needs 55 products
- 04.07 Charcoal clampshown above ↑← shown at left
- 06.02 Mined and roasted iron oreMaking Year 3 needs 48 products
- 06.03 Bloomery furnaceMaking Year 3 needs 52 products
- 04.22 Refractory clay mixshown above ↑← shown at left
- 04.25 Clay air nozzles (tuyeres)shown above ↑← shown at left
- 06.01 Double board bellows with flap valvesMaking Year 3 needs 51 products
- 02.15 Scraped, brain-tanned and smoked hidesshown above ↑← shown at left
- 05.15 Bronze sawMaking Year 3 needs 49 products
- 05.21 Bronze needles, pins, hooks, nails and rivetsMaking Year 3 needs 49 products
- 06.06 Smith's forgeMaking Year 3 needs 53 products
- 08.38 Raw rubber sheetMaking Year 15 needs 78 products
- 03.05 Drying racks and smokehouseFood Year 1 needs 15 products
- 04.10 Kiln-fired potteryshown above ↑← shown at left
- 06.21 Knives, shears, sickles and scythesMaking Year 4 needs 75 products
- 06.11 Shear steelMaking Year 4 needs 63 products
- 06.08 Forge weldingMaking Year 3 needs 61 products
- 06.10 Blister steelMaking Year 4 needs 58 products
- 06.12 Hardening and temperingMaking Year 4 needs 70 products
- 03.10 Rendered tallow and lardMaking Year 1 needs 21 products
- 01.14 Hot-stone boiling pitHome Year 1 needs 9 products
- 01.04 Digging stickMaking Year 1 needs 2 products
- 01.08 First fire and stone hearthshown above ↑← shown at left
- 01.12 Bamboo cups and water tubesMaking Year 1 needs 2 products
- 01.13 Split-stick tongsMaking Year 1 needs 3 products
- 02.21 Bow and arrows ⚠Food Year 1 needs 14 products
- 02.24 Carved wooden bowls and troughsshown above ↑← shown at left
- 06.06 Smith's forgeshown above ↑← shown at left
- 06.11 Shear steelshown above ↑← shown at left
- 06.17 Crank grindstoneMaking Year 4 needs 74 products
- 06.07 Iron hammers, tongs and anvilshown above ↑← shown at left
- 06.16 Augers, drill bits and braceMaking Year 4 needs 73 products
- 06.11 Shear steelshown above ↑← shown at left
- 06.14 Files and raspsMaking Year 4 needs 72 products
- 10.17 Rolling mill ⚠Making Year 23 needs 150 products
- 09.06 Overshot water wheelMaking Year 15 needs 101 products
- 09.01 Weir, mill pond and millrace with sluice gateMaking Year 14 needs 98 products
- 04.15 Slaked lime, mortar, plaster and whitewash ⚠Making Year 1 needs 27 products
- 06.22 Picks, shovels, hoes, crowbars and sledgehammersMaking Year 4 needs 72 products
- 07.11 Surveying kitKnowledge Year 5 needs 82 products
- 06.19 Chain and hooksMaking Year 4 needs 62 products
- 07.01 Standard measure of lengthKnowledge Year 4 needs 73 products
- 07.03 Layout toolsKnowledge Year 4 needs 75 products
- 07.09 Lodestone and magnetic compassKnowledge Year 5 needs 76 products
- 06.26 Steel needles, awls and fish hooksMaking Year 5 needs 75 products
- 06.12 Hardening and temperingshown above ↑← shown at left
- 06.20 Draw plate and drawn wireMaking Year 4 needs 73 products
- 07.17 Framed joineryMaking Year 6 needs 82 products
- 06.16 Augers, drill bits and braceshown above ↑← shown at left
- 07.03 Layout toolsshown above ↑← shown at left
- 07.14 Timber seasoning stacksMaking Year 5 needs 75 products
- 07.13 Saw pit and sawn planksMaking Year 5 needs 74 products
- 07.15 Carpenter's bench, planes, drawknife, spokeshave and malletsMaking Year 5 needs 76 products
- 07.16 Hide glueMaking Year 5 needs 24 products
- 07.31 Stone quarry and dressed blocksMaking Year 7 needs 88 products
- 06.13 Steel-edged axes, adzes and chiselsshown above ↑← shown at left
- 06.22 Picks, shovels, hoes, crowbars and sledgehammersshown above ↑← shown at left
- 07.29 Lifting craneMaking Year 7 needs 86 products
- 07.17 Framed joineryshown above ↑← shown at left
- 07.28 Pulley blocks, windlass and capstanMaking Year 7 needs 85 products
- 02.11 Three-strand ropeshown above ↑← shown at left
- 06.23 Iron hardwareMaking Year 4 needs 62 products
- 07.18 Pole latheMaking Year 6 needs 83 products
- 09.03 Undershot water wheelMaking Year 15 needs 100 products
- 07.17 Framed joineryshown above ↑← shown at left
- 09.01 Weir, mill pond and millrace with sluice gateshown above ↑← shown at left
- 09.02 Greased plain bearingsMaking Year 14 needs 67 products
- 09.16 Powered latheMaking Year 18 needs 100 products
- 07.18 Pole latheshown above ↑← shown at left
- 09.11 FlywheelMaking Year 17 needs 87 products
- 09.12 Leather belt drive and line shaftMaking Year 17 needs 97 products
- 07.18 Pole latheshown above ↑← shown at left
- 08.02 Leather goodsCloth Year 6 needs 89 products
- 06.21 Knives, shears, sickles and scythesshown above ↑← shown at left
- 06.26 Steel needles, awls and fish hooksshown above ↑← shown at left
- 08.01 Bark-tanned leatherCloth Year 6 needs 81 products
- 09.02 Greased plain bearingsshown above ↑← shown at left
- 10.13 Cast iron gears, shafts and machine framesMaking Year 22 needs 144 products
- 09.04 Wooden gearsMaking Year 15 needs 84 products
- 10.12 Iron castingsMaking Year 22 needs 143 products
- 10.10 Sand moulding with wooden patternsMaking Year 22 needs 84 products
- 10.11 Cupola remelting furnaceMaking Year 22 needs 141 products
- 10.02 FirebrickMaking Year 20 needs 24 products
- 10.07 Water-powered piston blowerMaking Year 21 needs 106 products
- 07.21 Barrels, buckets and tubsshown above ↑← shown at left
- 09.06 Overshot water wheelshown above ↑← shown at left
- 09.08 Water-blown bellowsMaking Year 16 needs 103 products
- 06.01 Double board bellows with flap valvesshown above ↑← shown at left
- 09.07 Cam shaft and trip hammer ⚠Making Year 16 needs 102 products
- 09.09 Crank and connecting rodMaking Year 16 needs 69 products
- 10.09 Pig iron ⚠Making Year 22 needs 140 products
- 04.07 Charcoal clampshown above ↑← shown at left
- 06.02 Mined and roasted iron oreshown above ↑← shown at left
- 10.03 Coke ⚠Making Year 20 needs 125 products
- 10.01 Coal mine ⚠Making Year 20 needs 123 products
- 06.30 Timbered underground mine ⚠Making Year 5 needs 77 products
- 07.35 Rock blasting ⚠Making Year 7 needs 92 products
- 06.13 Steel-edged axes, adzes and chiselsshown above ↑← shown at left
- 06.22 Picks, shovels, hoes, crowbars and sledgehammersshown above ↑← shown at left
- 07.34 Black powder ⚠Making Year 7 needs 89 products
- 04.07 Charcoal clampshown above ↑← shown at left
- 06.24 Lock and keyMaking Year 5 needs 73 products
- 07.02 Standard weights and volume measuresKnowledge Year 4 needs 74 products
- 07.32 Refined sulphurshown above ↑← shown at left
- 07.33 SaltpetreMaking Year 7 needs 60 products
- 03.21 Compost and manure heapFood Year 1 needs 20 products
- 03.14 Cleared and hoed garden plotsFood Year 1 needs 15 products
- 03.18 Animal pens and captured young stockFood Year 1 needs 17 products
- 04.18 PotashMaking Year 2 needs 26 products
- 05.22 Hammered copper sheet and riveted cauldronMaking Year 3 needs 52 products
- 07.45 Wooden wagonwayMaking Year 8 needs 88 products
- 06.18 Nails, spikes and rivetsMaking Year 4 needs 62 products
- 07.13 Saw pit and sawn planksshown above ↑← shown at left
- 07.27 Two-wheel cart and four-wheel wagonMaking Year 7 needs 86 products
- 09.21 Horse whimMaking Year 20 needs 103 products
- 10.02 Firebrickshown above ↑← shown at left
- 10.08 Blast furnace ⚠Making Year 21 needs 108 products
- 10.16 Water-driven shingling hammerMaking Year 23 needs 145 products
- 14.33 TelephoneKnowledge Year 43 needs 226 products
- 14.03 Insulated copper wireMaking Year 38 needs 185 products
- 08.22 Drop spindle and spun yarnCloth Year 11 needs 101 products
- 03.27 Hand spindle and narrow loomCloth Year 1 needs 25 products
- 03.26 Retting pit and cleaned bast fibreCloth Year 1 needs 24 products
- 02.25 Antler pick, bone shovel and stone hoeshown above ↑← shown at left
- 03.15 First planted cropsFood Year 1 needs 23 products
- 03.12 Seed collection and seed storeFood Year 1 needs 20 products
- 01.22 Safe-food listFood Year 1 needs 1 product
- 01.01 Base camp siteHome Year 1 raw materials only
- 02.17 Basketsshown above ↑← shown at left
- 03.08 Raised storehouse with rat guardsFood Year 1 needs 16 products
- 03.14 Cleared and hoed garden plotsshown above ↑← shown at left
- 07.18 Pole latheshown above ↑← shown at left
- 08.21 Prepared fibreCloth Year 11 needs 99 products
- 03.18 Animal pens and captured young stockshown above ↑← shown at left
- 03.26 Retting pit and cleaned bast fibreshown above ↑← shown at left
- 06.20 Draw plate and drawn wireshown above ↑← shown at left
- 06.21 Knives, shears, sickles and scythesshown above ↑← shown at left
- 07.18 Pole latheshown above ↑← shown at left
- 10.24 Rolled copper sheet, rod and long drawn wireMaking Year 25 needs 152 products
- 05.06 Open moulds and cast copper ingotsshown above ↑← shown at left
- 09.17 Powered wire-drawing benchMaking Year 19 needs 77 products
- 10.17 Rolling millshown above ↑← shown at left
- 11.13 Shellac varnishMaking Year 25 needs 128 products
- 11.10 Distilled alcohol ⚠Making Year 25 needs 127 products
- 08.14 Beer, wine and meadFood Year 9 needs 117 products
- 03.22 Log beehivesFood Year 1 needs 16 products
- 04.10 Kiln-fired potteryshown above ↑← shown at left
- 04.28 Sourdough starter and brewing yeastFood Year 2 needs 24 products
- 07.21 Barrels, buckets and tubsshown above ↑← shown at left
- 08.11 Harvest and threshing kitFood Year 9 needs 112 products
- 02.17 Basketsshown above ↑← shown at left
- 06.21 Knives, shears, sickles and scythesshown above ↑← shown at left
- 08.09 Rotating grain fieldsFood Year 8 needs 111 products
- 03.15 First planted cropsshown above ↑← shown at left
- 03.16 Fences and thorn hedgesFood Year 1 needs 15 products
- 03.17 Irrigation ditch and bamboo water pipeFood Year 1 needs 16 products
- 03.21 Compost and manure heapshown above ↑← shown at left
- 04.15 Slaked lime, mortar, plaster and whitewashshown above ↑← shown at left
- 08.06 Iron-shared plough and harrowFood Year 7 needs 101 products
- 08.40 Cane crusher, raw sugar and molassesFood Year 16 needs 106 products
- 04.15 Slaked lime, mortar, plaster and whitewashshown above ↑← shown at left
- 06.25 Hammered iron sheet, pans and griddlesshown above ↑← shown at left
- 07.18 Pole latheshown above ↑← shown at left
- 08.03 Trained draught animals with yoke, collar, harness and iron shoesshown above ↑← shown at left
- 08.39 Sugar cane fieldFood Year 16 needs 103 products
- 11.09 Copper still with coiled condenserMaking Year 25 needs 84 products
- 12.03 Iron-bed lathe with slide restMaking Year 30 needs 154 products
- 09.16 Powered latheshown above ↑← shown at left
- 10.13 Cast iron gears, shafts and machine framesshown above ↑← shown at left
- 10.27 Cast-steel cutting tools and springsMaking Year 25 needs 127 products
- 06.12 Hardening and temperingshown above ↑← shown at left
- 06.14 Files and raspsshown above ↑← shown at left
- 10.26 Crucible cast steelMaking Year 25 needs 126 products
- 12.02 Straightedges and squaresMaking Year 30 needs 149 products
- 12.01 Flat surface platesMaking Year 30 needs 148 products
- 14.06 Permanent steel magnetsMaking Year 39 needs 203 products
- 10.27 Cast-steel cutting tools and springsshown above ↑← shown at left
- 14.04 ElectromagnetMaking Year 38 needs 202 products
- 06.05 Wrought iron barshown above ↑← shown at left
- 14.02 Daniell cellMaking Year 38 needs 178 products
- 04.10 Kiln-fired potteryshown above ↑← shown at left
- 11.02 Blown glassMaking Year 24 needs 153 products
- 10.22 Welded iron pipeMaking Year 24 needs 151 products
- 11.01 Glass furnace and melted glassMaking Year 24 needs 79 products
- 11.18 Sulphuric acid ⚠Making Year 26 needs 157 products
- 05.27 Lead sheet, weights and pipe ⚠Making Year 3 needs 49 products
- 07.32 Refined sulphurshown above ↑← shown at left
- 07.33 Saltpetreshown above ↑← shown at left
- 11.04 Laboratory glasswareMaking Year 24 needs 154 products
- 11.25 Blue and green vitriolMaking Year 27 needs 158 products
- 11.26 Zinc metal ⚠Making Year 27 needs 37 products
- 14.01 Voltaic pileMaking Year 38 needs 169 products
- 03.06 SaltFood Year 1 needs 16 products
- 08.26 Fulled cloth and feltCloth Year 12 needs 110 products
- 04.19 SoapHome Year 2 needs 33 products
- 08.25 Woven clothCloth Year 12 needs 106 products
- 08.23 Spinning wheelCloth Year 12 needs 104 products
- 08.24 Treadle loomCloth Year 12 needs 102 products
- 10.24 Rolled copper sheet, rod and long drawn wireshown above ↑← shown at left
- 11.26 Zinc metalshown above ↑← shown at left
- 14.03 Insulated copper wireshown above ↑← shown at left
- 14.10 TelegraphKnowledge Year 39 needs 216 products
- 09.17 Powered wire-drawing benchshown above ↑← shown at left
- 11.02 Blown glassshown above ↑← shown at left
- 11.49 Zinc-coated iron wire and sheetMaking Year 29 needs 166 products
- 10.18 Rolled bar, rod and railMaking Year 24 needs 151 products
- 10.19 Iron plate and sheetMaking Year 24 needs 151 products
- 11.20 Hydrochloric acid ⚠Making Year 26 needs 160 products
- 11.26 Zinc metalshown above ↑← shown at left
- 11.30 Ammonia and sal ammoniacMaking Year 27 needs 163 products
- 11.20 Hydrochloric acidshown above ↑← shown at left
- 11.28 Coal gas works and gas light ⚠Making Year 27 needs 153 products
- 14.02 Daniell cellshown above ↑← shown at left
- 14.04 Electromagnetshown above ↑← shown at left
- 14.07 Circuit hardwareshown above ↑← shown at left
- 14.32 Dry cellMaking Year 43 needs 179 products
- 11.26 Zinc metalshown above ↑← shown at left
- 11.30 Ammonia and sal ammoniacshown above ↑← shown at left
- 14.21 Carbon rodsMaking Year 41 needs 168 products
- 04.09 Updraft kilnshown above ↑← shown at left
- 10.03 Cokeshown above ↑← shown at left
- 11.29 Coal tar, pitch and creosoteMaking Year 27 needs 154 products
- 12.27 Hydraulic pressMaking Year 34 needs 157 products
- 08.02 Leather goodsshown above ↑← shown at left
- 09.19 Bronze force pumpMaking Year 19 needs 94 products
- 05.19 Lost-wax castingMaking Year 3 needs 48 products
- 09.18 Suction pump and bored-log pipesMaking Year 19 needs 90 products
- 12.11 Cylinder boring millMaking Year 31 needs 151 products
- 21.01 RelayMaking Year 58 needs 217 products
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