41. For materials which are difficult to sinter , a process called liquid phase sintering is commonly used. 42. The Rhynie chert is an Early Devonian sinter ( hot spring ) deposit composed primarily of silica. 43. An even easier approach is to spray powder onto a moving belt and sinter it without compression. 44. Smelting was initially undertaken using sinter plants and blast furnaces, or with roasters and reverberatory furnaces. 45. The sinter cone for Castle Geyser has been dated to around 1022 using carbon-14 dating. 46. The process starts by charging solid sinter and heated coke into the top of the blast furnace. 47. Overflow of the springs can build masses, spires or stepped terraces of calcareous sinter or tufa. 48. Sinter plants, in combination with blast furnaces, are also used in non-ferrous smelting.49. Parts made with the Sinter process are lighter and cheaper than those made in cast iron or steel. 50. The British occupied New Amsterdam in 1644, renamed it New York and kept the Sinter Klaas legend.
