52 
ABBE. 
the best results from these photographs, Professor Bigelow 
personally visited the location and made sufficient measure- 
ments to enable him to convert the apparent distances given 
by the photographs into angles and linear distances; so that 
we are able to chart the position of the schooner and the 
waterspout from time to time during the 25 minutes em- 
braced by the photographs. Three spouts were seen in suc- 
cession, though it is probable that there was only one general 
whirl in the atmosphere, moving slowly southeastward while 
the spout-cloud appeared and disappeared. No photographs 
of its first appearance were obtained, but those of the second 
and third appearances are published as half tones in the 
M. W. Review for 1906 and are numbered as follows: 
Second appearance : 
A, 1 : 02 p. m., by Chamberlin at Cottage City. 
B, 1 : 03 p. m., by Coolidge at Cottage City. 
C, 1 : 08 p. m., by Hallet at Cottage City. 
D, 1: 12 p. m., by Dodge at Vineyard Haven. 
E, 1: 14 p. m., by Ward at Falmouth Heights. 
F, 1 : 17 p. m., by Coolidge at Cottage City. 
G, 1: 17 p. m., by Coolidge at Cottage City. 
Third appearance: 
A, 1 : 20 p. m., by Chamberlin at Cottage City. 
B, 1 : 24 p. m., by Chamberlin at Cottage City. 
C, 1 : 27 p. m., by Coolidge at Cottage City. 
By reducing the measurements made on the photographs 
to linear dimensions, Professor Bigelow arrives at the follow- 
ing figures, which will interest you, because they are cer- 
tainly the first that have ever been determined accurately for 
any waterspout: 
The diameter of the waterspout at sea-level was 240 feet; 
its smallest diameter midway between this and the cloud, 
144 feet; at its summit, or the lower surface of the cloud, the 
diameter was 840 feet. The approximate length of the tube, 
or height from the ocean to the lower surface of the cloud, 
3,600 feet. The height of the top of the cloud above its own 
