outside diameter, 2-1/8 in.; length between tube plates, 13 ft. 10-1/8
in.; outside heating surface, 1,166 square feet; fire box heating surface,
82 square feet; total heating surface, 1,248 square feet; fire grate area,
17 square feet; tractive power =
65 per cent. of boiler pressure × (cyl. diam.)² × stroke / diameter of wheels
= 0.65 × 120 × (18.125)² × 24 / 51 = 5.383 tons. Ratio of tractive power
to adhesion weight = 5.383 / 37.238 = 1 / 6.9.

_Tender._--Contents: water, 310 cubic feet, or 1,933 gallons, or 8½
tons; anthracite, 600 poods, or 10 tons; or wood, 1½ cubic sajene, or
514 cubic feet; weight empty, 13.477 tons; weight in running order, 28.665
tons; six wheels.

* * * * *

_Petroleum Refuse--Comparative Trials with Petroleum, Anthracite,
Bituminous Coal, and Wood, between Archeda and Tsaritsin on Grazi and
Tsaritsin Railway, in Winter Time._

-----+---+-----+------+---+-----+------+-----------+-------------+------+------------
| L | | | | | | | |
| o | | Train | | | | Consumption | |
| c | | alone. | | | | Including | |
Date.| o | | | | | | Lighting up.| |
1883.| m | |----+-----| | | | | Cost |
| o |Train|Num-| | Dis-| Car | | | of |Atmospheric
| t | |ber |Gross|tance|miles.| Fuel. |-------+-----| fuel |temperature
| i | | of |load.| run.| | | | Per | per | and
| v | |Loa-| | | | | Total |train| train| weather.
| e | |ded | | | | | |mile.| mile.|