RELATIVE COSTS.

Anthracite. Bituminous. Petroleum. Coal Generator Water

gas gas. gas.

New York $1 00 $1 08 $1 71 $14 92 $22 90 $8 70

Chicago 1 00 71 1 50 8 72 18 30 7 00

New Orleans 1 00 59 1 56 17 90 15 30 5 80

San Francisco 1 00 64 1 50 8 75 9 40 3 50

London 1 00 61 2 05 7 16 17 70 6 30

Port Natal 1 00 90 1 21

Sydney 1 00 34 1 39

Valparaiso 1 00 44 1 03

These figures are very much against the fluid fuels, but there may be

circumstances in which the benefits to be derived from their use will

exceed the additional cost. It is difficult to make a comparison without

considering particular cases, but for intermittent heating petroleum

would probably be more economical, though for a steady fire coal holds

its own.

* * * * *

Scientific American Supplement, No. 514, November 7, 1885 · 第 22 / 68 题