function clone_node(name)
	node2={}
	node=minetest.registered_nodes[name]
	for k,v in pairs(node) do
		node2[k]=v
	end
	return node2
end

furnace=clone_node("default:furnace")
furnace.groups.tubedevice=1
furnace.groups.tubedevice_receiver=1
furnace.tube={insert_object=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			if direction.y==1 then
				return inv:add_item("fuel",stack)
			else
				return inv:add_item("src",stack)
			end
		end,
		can_insert=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			if direction.y==1 then
				return inv:room_for_item("fuel",stack)
			elseif direction.y==-1 then
				return inv:room_for_item("src",stack)
			else
				return 0
			end
		end,
		input_inventory="dst"}
furnace.after_place_node= function(pos)
				tube_scanforobjects(pos)
			end
furnace.after_dig_node = function(pos)
				tube_scanforobjects(pos)
			end
minetest.register_node(":default:furnace",furnace)


furnace=clone_node("default:furnace_active")
furnace.groups.tubedevice=1
furnace.groups.tubedevice_receiver=1
furnace.tube={insert_object=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			if direction.y==1 then
				return inv:add_item("fuel",stack)
			else
				return inv:add_item("src",stack)
			end
		end,
		can_insert=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			if direction.y==1 then
				return inv:room_for_item("fuel",stack)
			elseif direction.y==-1 then
				return inv:room_for_item("src",stack)
			else
				return 0
			end
		end,
		input_inventory="dst"}
furnace.after_place_node= function(pos)
				tube_scanforobjects(pos)
			end
furnace.after_dig_node = function(pos)
				tube_scanforobjects(pos)
			end
minetest.register_node(":default:furnace_active",furnace)

chest=clone_node("default:chest")
chest.groups.tubedevice=1
chest.groups.tubedevice_receiver=1
chest.tube={insert_object=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			return inv:add_item("main",stack)
		end,
		can_insert=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			return inv:room_for_item("main",stack)
		end,
		input_inventory="main"}
chest.after_place_node = function(pos)
				tube_scanforobjects(pos)
			end
chest.after_dig_node = function(pos)
				tube_scanforobjects(pos)
			end
minetest.register_node(":default:chest",chest)