The consumption of gas with these motors costs from 1d. to 2d. per horse-power per hour, varying with the size; a 1 horse-power costs about 1¾d. The following are a few gas engines by reliable makers. Fig. 206 shows an “Otto” vertical gas engine (Crossley Bros., Limited, 24 Poultry, London), made in sizes from 5 man to 5 horse-power (nominal), giving from 1 to 9 indicated horse-power; a medium size, 1½ nominal horse-power (3 indicated horse-power), costs 103l., with water vessel, 4 ft flywheel, 180 revolutions a minute.
207. Horizontal Otto.
208. Stockport Gas Engine. 209. Bisschop Gas Engine.
Fig. 207 shows an “Otto” horizontal, made in sizes from ½ to 16 nominal horse-power, giving 2 to 40 indicated horse-power (the larger sizes have 2 flywheels); the cost of a 2 nominal horse-power (4 indicated horse-power) is 138l., with water vessel, 4 ft. 6 in. flywheel, 160 revolutions a minute. The Otto is at present receiving the greatest share of favour, and it certainly is a good one.
Fig. 208 shows a “Stockport” horizontal gas engine (J. E. Andrew & Co., Limited, 80 Queen Victoria Street, London), made in sizes from 6 man to 8 nominal horse-power, giving from 1½ to 15½ indicated horse-power; a medium size, 2 nominal horse-power (4 indicated horse-power), costs 128l., with water tank complete.
Fig. 209 shows a “Bisschop” vertical gas engine (J. E. Andrew & Co., as above), made in sizes from 1 man to 4 man power, costing from 28l. to 40l. This small engine requires no water tank.
Fig. 210 is the “Hercules” vertical gas engine (Turner Bros., St. Albans), sizes 1 man to 3 horse-power, costing from 18l. 15s. to 105l., with water tank complete. This is about the cheapest engine in the market.
