THE HOWGATE EXPEDITION TO LADY FRANKLIN BAY. 689 
Magnetic Observatory, before starting on the expedition, and also after the return. 
Qo ASS Chronometer very accurately rated in Mean Time. With these 
instruments, the declination dip and total intensity should be determined on the 
ist and 15th of each month. 
The differential observations of declination are to be made with the Decli- 
nometer every day, three times a day, namely, at 7 a. m., 3 p. m., and 11 p. 
m., Washington time, and are to be made by taking readings at the first second 
of every minute, for fifteen minutes, namely from 7 a. m. to 7:15 a. Mm; 3 Pp. M- 
tO 3:15 p. m.; I1 p. m. to 11:15 p. m. 
By this means there will be secured observations simultaneously with the 
Signal Service Meteorological observations, and also simultaneously with the mag- 
netic observations made at the observatories that pursue the Géttingen plan. By 
these means, also, data will be obtained for showing the rapid fluctuations to 
which needles are subject when an auroral disturbance is taking place. 
The term days will be the rst and 15th of each month, on which days, be- 
sides the fifteen minutes’ observations previously provided for, there will be made 
a special set of readings of the Declinometer, at the beginning of each five min- 
utes throughout the entire day, or if this be not possible, then, at least, in groups 
of two hours and fifteen minutes, viz.: from 6:15 a. m. to 8:15 a. m.; 2 p. m. to 
4:5 p. m.; 10 p. m. to 12:15 a. m., Washington time. 
Il —Tue MacGnetic OBSERVATIONS AT TEMPORARY Stations By TRav- 
ELING PaRTIES.—The outfit for this class of work will be as follows for each 
party : 
1. Cassella Astronomical Theodolite, as made by Fauth & Co., No. 60 of 
catalogue, which is considered decidedly preferable to the English make, it hav- 
ing 3-inch circles, and costing $150 with its stand. This instrument can be used 
for determination of latitude, time, longitude, azimuth and magnetic declination. 
2. Kew Dip Circle, small size, to be used for determination of magnetic 
dip and intensity. 
3. Two Pocket Chronometers, kept accurately rated on mean time. 
With these instruments the absolute dip and intensity should be determined 
at every convenient stopping place, andif the party stays long at any station, 
these elements should be determined each day, and especially at 7 a. m., 3 p. m.- 
and 11 p. m., Washington time, as before directed for the permanent station. 
The term day observations should be also kept up by the traveling parties, if they 
happen to be at convenient stations on the 1st and 15th of the month. 
Observers will have to be especially instructed in the use of the instruments. 
The best works of reference are: 
Riddell’s Magnetic Instructions, London, 1844. Admiralty Manual of 
Scientific Inquiry, 1871. Admiralty Arctic Manual, 1875. Walker’s Terrestrial 
and Cosmical Magnetism, 1866. Coast Survey Special Instructions. 
The form for records may be those given by Riddell, with such modifica- 
tions as the modern construction of magnetic instruments may demand. 
