46. Don’t forget to have your steam-gauge tested at least once in three months.
47. Don’t use a wire or metallic rod as a handle to a swab in cleaning the glass tube of a water-gauge for the glass may suddenly fly to pieces when in use within a short time afterwards.
48. Don’t forget that steam pumps require as much attention as a steam engine.
49. Don’t run a steam pump piston, unless in an emergency, at a speed exceeding 80 to 100 feet per minute.
50. Don’t do anything without a good reason for it about the engine or boiler, but when you are obliged to do anything, do it thoroughly and as quickly as possible.
51. Don’t forget to sprinkle a thin layer of coal on the grates before lighting the shavings and wood in the morning. This practice preserves the grate bars.
52. Don’t take the cap off a bearing and remove the upper brass simply to see if things are working well; if there is any trouble it will soon give you notice, and, besides, you never can replace the brass in exactly its former position, so that you may find that the bearing will heat soon afterwards, owing to your own uncalled-for interference.
53. Don’t put sulphur on a hot bearing, unless you intend to ruin the brasses.
54. Don’t use washed waste that has a harsh feel, as the chemicals used in cleansing it have not been thoroughly removed.