What is the Tasimeter?

It is an instrument, sensitive to the smallest degree of heat, and is
mostly used in astronomy. Attached to a telescope it will show the
heat coming from the stars.


What is a Bathometer?

This ingenious instrument, the invention of Prof. Siemens of London,
enables those on board of ships to read from an index the depths of
the ocean beneath them. It consists of a highly sensitive steel spring
to which a heavy piece of metal is attached. The changes in weight to
which the latter is subject in consequence of the variations of
attractive force (the deeper the ocean the smaller the latter, and
vice versa) are registered on a scale by the indicator that is in
connection with the steel spring.


What is an Anemometer?

An instrument for measuring the velocity and force of the wind, and by
which storms, at a distance, can be predicted.


What is a Chronometer?

A time-piece of delicate and exact construction, chiefly employed by
astronomers and navigators. It differs only from an ordinary watch in