1730. Water level apparatus
a) Made of neutral glass on wooden stand, available in 4 limbs and 5 limbs,
b) -do- made of corning glass

1731. Mercurial Barometer (Fortin's) standard.
All metallic The English and Metric system scales read from 25" to32" and 64cm. to 81 cms. respectively with reflector behind scales and cestern The vernier is actuated by a milled head at the side operating with rack and pinion and reads to .01" cms. The glass or plastic cistern has almost optically true surface. The thumb screw at the base work very smoothly and there is no surging of mercury. Mounted on teak wood base without mercury with corning glass parts.

1732. Mercurial Barometer (Fortin's Barometer) for high altitude called as Hill Barometer. Same as above, but with metric scale graduated from 52cms. to 73 cm and with inches scale graduated from 20.5 to 28.8 inches, making the barometer suitable for use at altitudes from 3000 to10000 feet above sea level.

1733. Fortin's Barometer
Complete made of brass. The Metric and English system scales read from 25" to 32" and 54 cm to 81 cms. respectively with reflector behinds scales and cistern. The vernier is worked by a milled head at the side operating with rack and pinion &reads .01" and .01 cm. respectively. Thumb screw at the base works very smoothly and there is no surging of mercury. The barometer tube and scales covering glass are made from corning glass. Mounted on wooden board fitted with metal thermo meter w/o mercury.

1734. Fortin's Barometer :
German type known as Automatic Barometer. Rigid construction. All brass. Metal cistern. No ivory point. The adjustment of mercury level is automatic. Without mercury.

1735. Fortin's Barometer :
Demonstration type small size about 18" long construction similar to standard Fortin's barometer, entire construction metallic.

1736. Teakwood case :
With glass on three sides.

1741. Precision New Boyle's law Apparatus
(University type) Extra precise (Combined with Charles law) vernier reads to 0.1 mm. Mirror avoids parallax error. Deilcate elevation adjustment includes interchangeable Air Thermometer Bulb and graduated closed tube : Metal reinforcing arm. Provided with air thermometer. This is a very well made apparatus intended for college level work. The tripod holds two rigid 19 mm. brass uprights for carrying the two tubes and a square center rod which is graduated in mm for 130 cm. A sliding index on the square rod carries a vernier for reading the scale to 0.1 mm. and mirror for eliminating parallax when adjusting to the meniscus level.A thumb screw is provided on the funnel-tube side for making fine adjustments fo the mercury level, and a metal brance to reinforce the connecting arm . Complete but without mercury.

1742. Boyle's law Apparatus :
Improved pattern, mercury reservoir held in clamp sliding on iron rod chrome plated overa wooden scale having vetrical reading one meter long with geavy iron base painted, provided with levelling screws. Complere with a set of hard glass tubes without mercury.

reading one meter long with geavy iron base painted, provided with levelling screws. Complere with a set of hard glass tubes without mercury.

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