6th. Economy. It costs only about half as much as a first class hand
engine, and about one-fourth as much as a steam engine, with their
necessary appendages, and the chemicals for each charge cost less than
two dollars.
* * * * *
HOW TO TOW A BOAT.
A correspondent of _Engineering News_ says: Those living on swift
streams, and using small boats, often have occasion to tow up stream. So
do surveyors, hunters campers, tourists, and others. One man can tow a
boat against a swift current where five could not row.
Where there are two persons, the usual method is for one to waste his
strength holding the boat off shore with a pole, while the other tows.
Where but one person, he finds towing almost impossible, and when bottom
too muddy for poling and current too swift for rowing, he makes sad
progress.
[Illustration]
The above cut shows how one man can easily tow alone. The light
regulating string, B, passes from the stern of the boat to one hand of
the person towing, T. The tow line, A, is attached a little in front of
the center of the boat. Hence when B is slackened the boat approaches
the shore, while a very slight pull on it turns the boat outward.
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