~— 
TEMPERATURE OBSERVATIONS IN LOCH EARN. 631 
Part III. p. 850, from which it will be seen that the loch is about 54 miles in length, 
with a very uniform basin, free from any sudden shallows, and also of fairly uniform 
breadth. It was decided to observe at five stations along the loch, each station being 
at a distance of about 1 miles from the next one, marked I. to V. on the sketch map 
fig. 1. To facilitate observation a boat was moored at each station, communication 
between this boat and the shore being kept up by means of a second boat. LKach boat 
was provided with a strong sounding machine, specially designed for the work, the 
nature of which will be seen from the accompanying illustrations. It consisted simply 
of a zine drum mounted at the end of a plank 5 feet long, which was fastened athwart 
the boat so that the drum projected over the side. The plank formed a convenient 
seat for the observer, and the whole arrangement worked satisfactorily. The sounding 
Fic. 2. 
wire consisted of a 3,-inch circumference flexible steel rope on which lead marks, 
numbered consecutively, were sweated at intervals of a metre. Negretti and Zambra 
deep-sea reversing thermometers were used, and with one or two exceptions were found 
to work satisfactorily. The messengers used were of the Macdonald pattern, and my 
good opinion of them was confirmed. 
In addition to the deep-sea thermometers a host of meteorological instruments were 
employed, three thermographs, two rain-gauges, wet and dry bulb thermometers, air- 
sling thermometers, and most important of all, a Dines recording anemograph. 
The principal meteorological station was at Tighnadalloch, a farm-house about 
13 miles from Lochearnhead, and it was here that the anemograph was erected. 
For each station four observers* were allotted, while to another observer was 
* Mr Herpert Bett, M.A., B.Sc., Edinburgh, was in charge of Station No. I.; Mr W. M‘Cuetuanp, Edinburgh, 
of No. II.; Mr A. J. Ross, M.A., Killin, of No. III.; Mr W. Watson, M.A., B.Sc., Edinburgh, of No. IV.; and 
Mr W. Mattocu, Perth, of No. V. The other observers were :—Messrs R. K. BurcHart, W. Innus, T. G. IRons1pe, 
M.A., B.Sc., W, Lippezt, W. G, M‘Eway, J. Macxtn, M.A., B.Sc., D. MacOwan, M.A., B.Sc., JonN MARSHALL, 
