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nuously in view. They should then fasten the other ends
of their cords to the loops on the handles of their instru-
ments and again face the distant object (Vide Fig. II).
Directions for taking the range of a Stationary
object with a 25 yard base.
15.—Observer No. 2's duties:—
(a) No. 2 looks through his instrument and obtains
coincidence between the distant object and the
ivory strip at No. 1's instrument by advancing or
retiring, i.e., by movements forwards and backwards.
(b) If the ivory strip appears to be to the left of
the distant object, No. 2 will advance; if to the
right, he will retire.
(c) Having nearly got the coincidence between the
distant object and No. 1's ivory strip, No. 2 will
advance his left foot (Vide Fig. IV) and complete
exact coincidence by a slight movement, backward
or forward, of his body—always taking care not
to move his feet.
(d) When he obtains exact coincidence he will call
"on."
16.—Observer No. 1's duties:—
(a) No. 1 facing the distant object, advances his
right foot well forward and stands as rigidly as
possible (Vide Fig III) keeping the cord between
himself and observer No. 2 slightly stretched.
(b) Then by working through his instrument, No. 1
obtains coincidence by turning the drum D.
(c) When No. 2 calls "on," No. 1 gives the drum a
final turn (if necessary, i.e., if the coincidence is
not already complete) in order to obtain more
perfect coincidence.
17.—The figure thus indicated would mean the range
in yards.
Directions for taking the range of a moving object
with a 25 yard base.
18.—Observer No. 2's duties:—
(a) If the object be moving from left to right,
No. 2 will obtain his coincidence with the distant
Roughly two thirds of characters agree with a modern printed edition of the same text. Much of the disagreement is editorial, not misreading. Treat the transcription as a finding aid and read the page image before quoting. How this was measured.