(275) 
could be given to my future observations, has been fulfilled. In 
August 1900, at Chiloango, my present station, situated on the 
mouth of the Chiloango-river in Portuguese West-Africa I received 
a universal instrument made by G. Heypre at Dresden, and in this 
paper I take the liberty of communicating to the Academy the 
results of the observations for the determination of latitude and 
longitede of Chiloango made till now with this instrument. 
The instrument has circles of 14 e.m. in diameter, which both 
are movable and hence different parts of the limb may be used. 
The circles are divided to 10’ and each of them is read by two 
microscopes. The distance of the threads of the micrometer screws 
is such that two revolutions correspond with an interval of 10! 
and each micrometer head is divided into 60 parts so that one 
division represents 5, of which tenth parts may be estimated. The 
telescope placed at the end of the horizontal axis is 28 m.m. in 
aperture and 25 em. in focal length and has a magnifying power 
of 30 times. The reticule consists of 2 horizontal threads at a 
distance of about 50” and 7 vertical ones, it may however be 
turned 90°. 
The value of a division of the two levels is 5" according to the 
instrumentmaker, and as till now the instrument has been used almost 
exclusively for observations of zenith distances, I have for the present 
investigated the alidade-level only. This level is graduated from 
0 to 25. For readings for the middle of the bubble between 9 
and 16 (the Jength of the bubble being here always equal to 9—10 
parts) I have found for the value of a part on 3 days: 
Ep S514 
5 .50 
Sash 
mean result 1p. = 5'.40 
Towards the ends on the contrary the value of a part was found 
to be about 3'.5. 
As the soil about Chiloango is so elastic as to render the obser- 
vations very difficult, if the instrument were mounted on a wooden 
or iron tripod, I had a stone pier made. This pier is surrounded 
by an insulated floor, tand is protected by a zine roof which can 
be opened in two directions and can moreover be moved, so that 
