Government of
Ronghong
Fau CIO, P/06 L
sop April, sops
Dated A
REQUISITION FOR INSTRUMENTS, &c.
INSTRUMENTS.
FOR THE
Rashital
Use of The Coot Civil K.
No.
£
8.
SURGICAL MATERIALS.
No.
£
457
828
tal Instruments, Full Sets
NEGRETTI &-ZAMBRA'S PATENT MAXIMUM SELF-REGISTERING THERMOMETER, For the determination of-the-Maximum Temperature of the Air.
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Negretti & Zambra's Patent Self-Registering Maximum Thermometer consists of a tube of mercury fitted on a porcelain or metal scale, with the divisions engraved on the glass tube, as shown in (fig. 1). The thermometer tube above the mercury is entirely free from air; and in the bend above the ball, is inserted and fixed with the blow-pipe, a small piece of solid glass, or enamel, which acts as a valve, allowing mercury to pass on one side of it when heat is applied; but not allowing it to return when the thermometer cools. When mercury bas been once made to pass the valve, which nothing but heat can effect, and has riseu in the tube, the upper end of the coluing registers the maximum temperature. To return the mercury to the bulb, we must apply a force equal to that which raised it in the tube; the force employed is gravity, and is applied by simply lowering the bulb end of the thermometer, when the gravity of the mercury in the tube will be sufficient to unite it with that in the bulb, and thus prepare the instrument for future observation.
Directions for Use.-Suspend the thermometer by means of two brass plates (B, C) in such manner that the instrument hangs horizontally, and place it in the shade, with the air passing freely to it on all sides; then, on an increase of heat, the mercury will pass up the tube as in an ordinary thermometer, and continue doing so as long as the heat increases.
On a decrease of heat, the contraction of mercury will take place below the bend in the tube, leaving the whole column of mercury in the tube, thus registering the highest temperature, and showing such till the instrument is disturbed.
To prepare the instrument for future observations, it is only necessary to remove the thermometer from the hooks or fastenings, and hold it in an upright position, bulb downwards, the mercury should then descend in the tube and indicate the present temperature of the surrounding air. If the mercury should not descend easily, giving the bulb end of the frame of the thermometer a few gentle taps on a table or swinging the thermometer bulb downwards will cause it to do so, and be again ready for future observation.
NEGRETTI & ZAMBRA'S PATENT SOLAR RADIATION THERMOMETER.
FIG. 2.
This instrument is one of Negretti & Zambra's Patent Maximum Thermometers with a blackened bulb, the scale divided on its own stem, and the divisions protected by a glass shield. In use it should be placed horizontally, with its bulb in the full rays of the sun, resting on gras5.
The directions for using this instrument are identical with those for determining the maximum temperature of the air as given above.
NEGRETTI & ZAMBRA'S VACUUM SOLAR RADIATION THERMOMETER.
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This Instrument consists of Negretti & Zambra's Solar Radiation Thermometer, inclosed in a glass tube and globe as shown in fig 3. All air being exhausted from this tube, the bulb is protected from the loss of heat which would ensue if the bulb were exposed. If placed side by side with an exposed bulb thermometer the Vacuum Radiation Thermometer will indicate 20 to 30 degrees higher temperature. When the air has been in rapid motion a difference of 50 degrees has been observed.
refer to Wrips Illustrated
1863.5
Money column to be left blank.
N.B-his form to be invariably forwarded in duplicate.